I have a 79 Bu,1 inch lowering springs, I bought prostars 15x8 with 3.5 bs for rear and 15x6 for front, I put 275-60 goodrich drag radials on and they rubbed bad so then I bought 255-60 M/T ET street slicks and they rub on hard bumps only and if I air up my bags they dont rub at all..Recently I took welds off for winter storage and put the 275-60s on some old S-10 alum. 15x7s and they fit perfect and look so much better than the 255s,If you can find 3.75 or 4 inch BS thats what I would do.I recently picked up some prostars with 4.5 bs as im gonna notch frame and try and get 295-50x15s tucked inside,If you can find out what factory bs is on 93 s-10 alum.15x7s go with that bs..because the 275s fit so well I regret buying notch kit and 4.5 BS wheels ..