I purchased a disk conversion kit from summit racing it was labeled a standard disk brake conversion I had previously had 14 inch tires now my old tires don't fit I found out I have to move to 15 inch but beyond that no one at summit or the company that made it could tell me the bolt pattern or offset or back spacing I would need any help would be appreciated

 

Wilwood tech may be able to help you.
FF

 

My '69 Barracuda has the '74 Dart front manual disc setup on it.
I have these wheels on the front using the 5X4-1/2 BC (1/2-20R studs) .......
Weld Draglite 90-Series Wheel
Size: 15" x 5"
Bolt Circle: 5 x 4-1/2'', 4-3/4''
Rear Spacing: 3-1/2''