X1000
Talk with Brian at 4WU and he knows his shit. There is an article in 4WD Toyota Owner magazine on 3 & 4 link suspension written by Brian as well.
I don’t have the heater option on my ‘99 and it fits like a glove! Perfectly snug and couldn’t be more happier. Sanding and paint my outlet cover this week. :D
He has couple eBay listings (his eBay username is jdaz123) - purchase one of his listings then follow his instruction via item description. It’s easy as 1-2-3. Lightning fast service and I got mine back repaired within 5 days. Hope it helps..