its a regular stock rear
Look on your vin plate inside the engine bay, by the trans/diff you'll have something like T50/S292 or T292... the S or T is the diff type, 6.38" or 6.7"... if you don't have a vin plate inside teh engine bay look at the diff center to housing flange and count the number of bolt, 8 = S type 6.38"; 10 = T type 6.7".
Normally only real SR5 had the T type (same as a zenki GT-S AE86) and all the other had the S type (same as all SR5 AE86). As said above, the housing will not swap without extensive modding (shortening, cutting 4 links and welding leaf spring seat). But you can swap the diff center... but don't try to mix diff type, S goes with S and T goes with T.