i just used a 2000 blazer rearend. 98+ blazers rearend are narrower than stock isuzu with disc brakes. everything worked out just fine including the brake lines and used an s10 swb driveshaft. if you already have the gm rearend if your vin starts with a 4 you can use the isuzu yoke on the s10 rearend with the isuzu driveshaft. that gives you 4 3/4 lug pattern. from there you can either get the 4 1/2 pattern drilled or use adapters to match the yota front. wheel adapters make it about the same width as the yota rear, without its a little narrower.