If I am not mistaken the LS Alloy rims are a little wider than the Gen 1 Steelies. I think its 15x6 vs 15x6.5 or so. As far as having 31x10.5's on stock rims I have had no issues with tire places on that. I have only had issues with them saying the LS Rims aren't made for my truck...was a major PITA...

88 Raider(Red):160k-Reman'd 2.6-5spd-Weber-SW Hubs-34x9.5 TSL-OffRd Pkg-1"Tbar-2"BL-CB
88 Raider(Silver):No 2.6/Bad KM145 Parts/Project
88 Montero(Brown):No 2.6,4.88s Parts/Project

[b]4X4 STICKERS,SHIRTS,ETC:
4WD Stickers AT COST.[b]