DOUBLE CONVOLUTED AIR SPRING CHART
Double-Convoluted air bags from Firestone come in a wide selection of ride heights with various port and bolt configurations. The have a double bellows and look like two air springs stacked on top of each other.
| Part Number | Top Plate Hole/Stud | Bottom Plate Hole/Stud | Top Plate Dia. | Bottom Plate Dia. | Collapsed Height | Flexmember |
|---|---|---|---|---|---|---|
| 2B9-229 | 1 | 1 | 6.4 | 6.4 | 2.9 | 578-92-3-202 |
| 2B9-245 | 1 | 1 | 6.4 | 6.4 | 4.2 | 578-92-3-202 |
| 2B9-296 | 1 | 2 | 6.4 | 6.4 | 3.2 | 578-923-211 |
| 2B9-218 | 1 | 2 | 6.4 | 6.4 | 3.5 | 578-92-3-206 |
| 2B9-230 | 1 | 2 | 6.4 | 6.4 | 3.8 | 578-92-3-202 |
| 2B10-226 | 1 | 2 | 6.4 | 6.4 | 3.1 | 578-92-3-250 |
| 2B9-246 | 2 | 1 | 6.4 | 6.4 | 3.8 | 578-92-3-211 |
| 2B12-304 | 2 | 1 | 9 | 9 | 3.4 | 578-92-3-309 |
| 2B12-411 | 2 | 1 | 9 | 9 | 3.5 | 578-92-3-309 |
| 2B12-412 | 2 | 1 | 9 | 9 | 4.2 | 578-92-3-309 |
| 2B9-244 | 2 | 2 | 6.4 | 6.4 | 3.8 | 578-92-3-202 |
| 2B9-252 | 2 | 2 | 6.4 | 6.4 | 3.8 | 578-92-3-206 |
| 2B9-254 | 2 | 2 | 6.4 | 6.4 | 3.8 | 578-92-3-206 |
| 2B9-265 | 2 | 2 | 6.4 | 6.4 | 3.8 | 578-92-3-206 |
| 2B9-266 | 2 | 2 | 6.4 | 6.4 | 3.8 | 578-92-3-208 |
| 2B9-607 | 2 | 2 | 6.4 | 6.4 | 3.8 | 578-923-208 |
| 2B9-611 | 2 | 2 | 6.4 | 6.4 | 3.8 | 578-923-211 |
| 2B9-614 | 2 | 2 | 6.4 | 6.4 | 3.8 | 578-9-23-211 |
| 2B9-280 | 2 | 2 | 6.4 | 6.4 | 3.9 | 578-92-3-211 |
| 2B12-410 | 2 | 2 | 9 | 9 | 3.4 | 578-92-3-309 |
| 2B12-427 | 2 | 2 | 9 | 9 | 3.4 | 578-92-3-309 |
| 2B12-432 | 2 | 2 | 9 | 9 | 3.5 | 578-92-3-309 |
| 2B12-434 | 2 | 2 | 9 | 9 | 3.5 | 578-92-3-310 |
| 2B12-307 | 2 | 2 | 9 | 9 | 3.8 | 578-92-3-305 |
| 2B12-313 | 2 | 2 | 9 | 9 | 3.8 | 578-92-3-309 |
| 2B12-317 | 2 | 2 | 9 | 9 | 3.8 | 578-92-3-310 |
| 2B12-324 | 2 | 2 | 9 | 9 | 3.8 | 578-92-3-310 |
| 2B12-345 | 2 | 2 | 9 | 9 | 3.8 | 578-92-3-315 |
| 2B12-346 | 2 | 2 | 9 | 9 | 3.8 | 578-92-3-315 |
| 2B12-402 | 2 | 2 | 9 | 9 | 3.8 | 578-92-3-310 |
| 2B12-440 | 2 | 2 | 9 | 9 | 3.8 | 578-92-3-315 |
| 2B12-319 | 2 | 2 | 9 | 9 | 4.2 | 578-92-3-309 |
| 2B12-406 | 2 | 2 | 9 | 9 | 4.2 | 578-92-3-309 |
| 2B12-463 | 2 | 2 | 9 | 9 | 4.2 | 578-92-3-309 |
| 2B14-383 | 2 | 2 | 11.3 | 11.3 | 4.2 | 578-92-3-356 |
| 2B14-367 | 2 | 4 | 11.3 | 11.3 | 4.2 | 578-92-3-353 |
| 2B14-366 | 2 | 4 | 11.3 | 11.3 | 4.9 | 578-92-3-353 |
| 2B6-530 | 3 | 2 | 4.15 | 4.15 | 2.8 | 579-923-510 |
| 2B6-535 | 3 | 2 | 4.15 | 4.15 | 2.8 | 579-92-3-515 |
| 2B8-550 | 3 | 2 | 5.03 | 5.03 | 2.9 | 579-92-3-530 |
| 2B9-216 | 3 | 2 | 6.4 | 6.4 | 3.2 | 578-92-3-202 |
| 2B9-606 | 3 | 2 | 6.4 | 6.4 | 3.2 | 578-923-211 |
| 2B9-210 | 3 | 2 | 6.4 | 6.4 | 3.3 | 578-92-3-202 |
| 2B9-250 | 3 | 2 | 6.4 | 6.4 | 3.5 | 578-92-3-206 |
| 2B9-270 | 3 | 2 | 6.4 | 6.4 | 3.5 | 578-92-3-206 |
| 2B9-200 | 3 | 2 | 6.4 | 6.4 | 3.8 | 578-92-3-202 |
| 2B9-201 | 3 | 2 | 6.4 | 6.4 | 3.8 | 578-92-3-202 |
| 2B9-206 | 3 | 2 | 6.4 | 6.4 | 3.8 | 578-92-3-202 |
| 2B9-251 | 3 | 2 | 6.4 | 6.4 | 3.8 | 578-92-3-206 |
| 2B9-253 | 3 | 2 | 6.4 | 6.4 | 3.8 | 578-92-3-206 |
| 2B9-255 | 3 | 2 | 6.4 | 6.4 | 3.8 | 578-92-3-206 |
| 2B9-239 | 3 | 2 | 6.4 | 6.4 | 3.9 | 578-92-3-211 |
| 2B12-305 | 3 | 2 | 9 | 9 | 3 | 578-92-3-310 |
| 2B12-416 | 3 | 2 | 9 | 9 | 3 | 578-92-3-315 |
| 2B12-425 | 3 | 2 | 9 | 9 | 3.5 | 578-92-3-309 |
| 2B12-429 | 3 | 2 | 9 | 9 | 3.5 | 578-92-3-309 |
| 2B12-446 | 3 | 2 | 9 | 9 | 3.5 | 578-92-3-310 |
| 2B12-424 | 3 | 2 | 9 | 9 | 3.8 | 578-92-3-309 |
| 2B12-309 | 3 | 2 | 9 | 9 | 4.2 | 578-92-3-309 |
| 2B12-318 | 3 | 2 | 9 | 9 | 4.2 | 578-92-3-309 |
| 2B12-426 | 3 | 2 | 9 | 9 | 4.2 | 578-92-3-309 |
| 2B12-428 | 3 | 2 | 9 | 9 | 4.2 | 578-92-3-310 |
| 2B12-300 | 3 | 2 | 9 | 9 | 4.9 | 578-92-3-309 |
| 2B12-320 | 3 | 2 | 9 | 9 | 4.9 | 578-92-3-309 |
| 2B7-548 | 3 | 3 | 5.03 | 5.03 | 2.2 | use 005079 |
| 2B9-288 | 3 | 3 | 6.4 | 6.4 | 3.9 | |
| 2B9-225 | 5 | 2 | 6.4 | 6.4 | 3.5 | 578-92-3-202 |
| 2B14-354 | 5 | 4 | 11.3 | 11.3 | 3.5 | 578-92-3-353 |
| 2B14-360 | 5 | 4 | 11.3 | 11.3 | 3.5 | 578-92-3-353 |
| 2B14-469 | 5 | 4 | 11.3 | 11.3 | 3.6 | 556-23-8-329 |
| 2B14-476 | 5 | 4 | 11.3 | 11.3 | 3.6 | 578-92-3-356 |
| 2B14-470 | 5 | 4 | 11.3 | 11.3 | 3.8 | 578-92-3-356 |
| 2B14-479 | 5 | 4 | 11.3 | 11.3 | 3.8 | 578-923-356 |
| 2B14-356 | 5 | 4 | 11.3 | 11.3 | 4.2 | 578-92-3-353 |
| 2B14-359 | 5 | 4 | 11.3 | 11.3 | 4.2 | 578-92-3-353 |
| 2B14-363 | 5 | 4 | 11.3 | 11.3 | 4.2 | 578-92-3-356 |
| 2B14-365 | 5 | 4 | 11.3 | 11.3 | 4.2 | 578-92-3-356 |
| 2B14-462 | 5 | 4 | 11.3 | 11.3 | 4.2 | 578-92-3-356 |
| 2B14-473 | 5 | 4 | 11.3 | 11.3 | 4.4 | 578-92-3-353 |
| 2B14-355 | 5 | 4 | 11.3 | 11.3 | 4.9 | 578-92-3-353 |
| 2B9-240 | 8 | 8 | 7.07 | 7.07 | 3.5 | 578-92-3-202 |