| BMW | 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) |
| 3 Series 2 Door | 84 - 91 | Q30 - 35 1/2" | 4" | Q30 - 34 3/4" | 36" |
| 3 Series 4 Door | 84 - 91 | Q30 - 35 1/2" | 4" | Q30 - 30 3/4" | 36" |
| 3 Series 4 Door | 92 - 95 | Q18 - 35 3/4" | 8" | Q18 - 34 1/2" | 31" |
| 5 Series Sedan | 79 - 88 | Q30 - 39 1/2" | 5" | Q30 - 39 7/8" | 36" |
| 5 Series Sedan | 89 - 95 | Q24 - 38" | 6" | Q24 - 37 1/4" | 32" |
| 5 Series Wagon | 92 - 95 | Q4 - 40 1/2" | 12" | Q4 - 39 1/4" | 32" |
| 7 Series Sedan | 79 - 87 | Q30 - 42 1/4" | 6" | Q31 - 40 1/4" | 36" |
| 7 Series Sedan | 88 - 94 | Q24 - 38" | 6" | Q24 - 38 3/4" | 36" |
| 7 SeriesSedan | 95 - 96 | Q4 - 41 1/2" | 8" | Q4 - 41 1/2" | 32" |
