Greg, GT750 front ends will bolt straight on, the fork tubes will have to raised up throught the triple clamps(GT750)to get the geometry right. I also think that GS750 front ends will go on as well. It's well worth while fitting tapered head bearings, these are pretty easily available as Suzuki seems to have used the same diameter stem tube for lot of the earlier models eg T500, GT750 and GS models.