If you're not going for 100% original I say do a 3". They will fit flush with the face of the wheel.

This is what a 2.5" looks like on a 15x7
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1969 Verdoro Green GTO
#Matching 400 + .045, 4.21 Ohio Forged Crank, SD 290 KRE heads, Torker II, OF Cam, Etc...
1978 W72 Marty Blue T/A GONE
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