| Volvo | Model Year | Closest distance between forward towers - (M1) | Distance from uppermost windshield to forwardmost tower foot - (M2) | Closest distance between rear towers - (M3) | Crossbar spread distance center to center - (M4) |
| 240/260 Sedans | 79/93 | Q31 - 41 3/8" | 5" | Q31 - 41 3/4" | 36" |
| 240/260 Sedan w/ Q Strech Kit | 79/93 | Q31 - 41 3/8" | 5" | Q31 - 41 3/4" | 43" |
| 240/260 Wagons | 79/93 | Q32 - 41 1/8" | 6" | Q32 - 41 1/2 | 36" |
| 240/260 Wagons Max Crossbar Spread | 79/93 | Q32 - 41 1/8" | 6" | Q32 - 40 5/8" | 82" |
| 740/760 Sedan | 83/90 | Q24 - 42 1/2" | 4" | Q24 - 42 1/2" | 36" |
| 740/760 Sedan | 83/90 | Q24 - 42 1/2" | 4" | Q24 - 42 1/2" | 45" |
| 740/940/960 Sedans | 91/96 | Q30 - 43 3/4" | 4" | Q31 - 42 7/8" | 36" |
| 740/940/960 Sedans | 91/96 | Q30 - 43 3/4" | 4" | Q31 - 42 5/8" | 45" |
| 740/760 Wagons | 83/90 | Q33 - 42 1/2 | 5" | Q33 - 42 1/4" | 36" |
| 740/760 Wagons Max Crossbar Spread | 83/90 | Q33 - 42 1/2 | 5" | Q33 - 42 1/4" | 81" |
| 740/940/960 Wagons | 91/96 | Q33 - 42 7/8" | 5" | Q33 - 43" | 36" |
| 740/940/960 Wagons Max Crossbar Spread | 91/96 | Q33 - 42 7/8" | 5" | Q33 - 42 3/8" | 81" |
| 850 Sedan | 94/96 | Q51 - 44 3/4" | 8" | Q51 - 43 1/4" | 32" |
| 850 Wagon | 94/96 | Q51 - 44 3/4" | 11" | Q51 - 42 5/8" | 32" |
