this is how i adapted my 6 to 5 lug fender mount
since the stock spare was 5'' wide and i'm running 255/15/r70 on a 8'' wide rim, i had to move the spare out 1/2''
i also adjusted the bolt pattern down to fit the cutout in the fender (centered in the arc)
i made this adapter out of 1/2'' plate, this is the first fitting, i did more trimming
studs are stock, i cut them off and plug welded them; holes are new pattern, i used grade 5 bolts for new studs
i also smoothed the seam inside