4" to 4.5" bolt pattern, the lugs obviously fit your wheels so buy the correponding drums. As far as strength is concerned, you may have an issue. Get photos of the back side and post them here.
I Agree.. And if you need new drums I'd look at swapping on B body BBP drums... As long as the offset matches it should be fine.... I don't see the amount of meat outside the studs as being concerning at all....
