Dimension
Make/Model Year Engine Part # GM Part # A B
Full Size
Full Size 1958-61 283, 348 50510 3990914 1-11/16" 2-5/8"
Full Size 1961 409 50512 3990916, 6258154 1-3/4" 2-3/4"
Full Size 1962-65 283, 327 50510 3990914 1-11/16" 2-5/8"
Full Size 1962-65 396, 409, 427 50512 3990916, 6258154 1-3/4" 2-3/4"
Full Size 1966-67 283, 327 *50510 3990914 1-11/16" 2-5/8"
Full Size 1966-67 396, 427 50512 3990916, 6258154 1-3/4" 2-3/4"
Full Size 1968-69 307 (exc. Police) 50510 3990914 1-11/16" 2-5/8"
Full Size 1968-69 307 (Police) 50512 3990916, 6258154 1-3/4" 2-3/4"
Full Size 1968-69 327 *50510 3990914 1-11/16" 2-5/8"
Full Size 1968-69 396, 427 50511 3962748, 3990918, 3990920 2-1/8" 2-3/8"
Full Size 1970-72 350 (w/2bbl. carb.) 50510 3990914 1-11/16" 2-5/8"
Full Size 1970-72 454 50511 3962748, 3990918, 3990920 2-1/8" 2-3/8"
Camaro
Camaro 1967-68 302 50512 3990916, 6258154 1-3/4" 2-3/4"
Camaro 1967-68 327 50510 3990914 1-11/16" 2-5/8"
Camaro 1967-68 350, 396 50512 3990916, 6258154 1-3/4" 2-3/4"
Camaro 1969 302 50511 3962748, 3990918, 3990920 2-1/8" 2-3/8"
Camaro 1969 307 50510 3990914 1-11/16" 2-5/8"
Camaro 1969 350 50511 3962748, 3990918, 3990920 2-1/8" 2-3/8"
Camaro 1970-72 350 (Exc. Spec. Hi. Perf.) 50510 3990914 1-11/16" 2-5/8"
Camaro 1970-72 350 (Spec. Hi. Perf.) 50511 3962748, 3990918, 3990920 2-1/8" 2-3/8"
Camaro 1970-72 396, 402 50512 3990916, 6258154 1-3/4" 2-3/4"
Camaro 1974-81 307, 350 50513 ***332648 2-7/64" 2-1/2"
Camaro 1982-92 305, 350 **50511 3962748, 3990918, 3990920 2-1/8" 2-3/8"
Chevelle
Chevelle 1964-67 283, 327 50510 3990914 1-11/16" 2-5/8"
Chevelle 1964-67 396, 427 50512 3990916, 6258154 1-3/4" 2-3/4"
Chevelle 1968-69 307, 327, 350 50511 3962748, 3990918, 3990920 2-1/8" 2-3/8"
Chevelle 1968-69 396 50512 3990916, 6258154 1-3/4" 2-3/4"
Chevelle 1970-72 307, 350, 402, 454 50511 3962748, 3990918, 3990920 2-1/8" 2-3/8"
Chevelle 1973-88 307, 350, 402, 454 50513 ***332648 2-7/64" 2-1/2"
Chevy II, Nova
Chevy II, Nova 1964-69 283, 327 50510 3990914 1-11/16" 2-5/8"
Chevy II, Nova 1968-69 350 50511 3962748, 3990918, 3990920 2-1/8" 2-3/8"
Chevy II, Nova 1968-69 396 50512 3990916, 6258154 1-3/4" 2-3/4"
Chevy II, Nova 1970-72 350 (Exc. Spec. Hi. Perf.) 50510 3990914 1-11/16" 2-5/8"
Chevy II, Nova 1970-72 350 (Spec. Hi. Perf.) 50511 3962748, 3990918, 3990920 2-1/8" 2-3/8"
Chevy II, Nova 1970-72 396, 402 50512 3990916, 6258154 1-3/4" 2-3/4"
Chevy II, Nova 1973-79 307, 305 50513 ***332648 2-7/64" 2-1/2"
Corvette
Corvette 1963-82 305, 327, 350, 396, 427, 454 50512 3990916, 6258154 1-3/4" 2-3/4"
Monte Carlo
Monte Carlo 1970-72 350, 402, 454 50511 3962748, 3990918, 3990920 2-1/8" 2-3/8"
Monte Carlo 1973-87 307, 350 50513 ***332648 2-7/64" 2-1/2"

*Some models use #555-50511, check dimensions of original mounts
**Use JEGS Frame Pad #555-50521
***Replaces OEM ONLY when used with #555-50520