1/4" spacers should be all you need. The stripper came with something from the FLAPS. Not hubcenteric so you got to be carefull when bolting up wheels.
I got studs and steel nuts. I don't think I could cope with bolts as often as I change tiars. Especially because my 1970 is not even hub centric on the front.
So are your bolts long enough? I think you need to make sure the end og the bolt goes all the way through the hub flange. for the front someone said 9/16" thread engagement. I have also heard 9 turns in. But really IDONNO