OEM 15 x 7 steel wheel bckspaces?

Factory steel wheels , starting in about 67-68 time period , used a 9 inch dogdish cap.
Wheel sizes 15 x 5 , 15 x 5.5 , 15 x 6 , 15 x 6.5 , 15 x 7 and 15 x 8 . Backspace varies depending upon the size rim shell. 15 x 7 wheels were 4 1/4 backspace , 15 x 8 wheels were 4 1/4 backspace. Cop wheels ( 15 x 7 ) only size made , were 4 1/4.
This is measured all the way to the back edge of the wheel. Width is measured bead seat to bead seat. A lot of the wheels are stamped on the inside of the band , but many are not.

What I usually tell people that say " Hey I have this wheel or that wheel and it is like this" I say show me the wheel in person , that will convince me. Been there , done that...

Frank