Every single 15 x 7 factory stock police wheel that I have ever measured , have a 4 1/4 backspace.
Also the factory 15 x 8 Ramcharger wheels ( part 550 ) have a backspace of 4 1/4 also.
Aftermarket 15 x 8 steel wheels are usually set at 4 1/2 backspace.

Frank
The Wheel Guy

Last edited by duster2; 06/08/20 02:06 PM.