with vintage muscle cars (1965-'71) 14" tire is where it was (STD), 15" exceptions:

1968-'69 HEMI b-bodies
BOSS 302 & 429 Mustangs
AAR, T/A, & HEMI 'Cudas & Challengers
Camaro Z/28s
1970-'71 GSX Buicks
1969 HURST/OLDS

that's like "IT", I'm sure I left some out ('Vettes & full size intentionally)