were can i buy from they come with u bolts

check links page car life and goo parts and yes they should come with u bolts

But.... lowering blocks won't work with coil springs.
Aren't all the 89 on Hiaces coil rear?

yes most are coil springs but there is the odd one or two with leaf, you could go with lowered coil springs if that is what you've got

mines a 93 and its rear leaf....I think its more than the odd one as well....

yes your right sorry brain mist on my part . going to cut the springs down did it on my cressida and a few others .

Lowering blocks will lower leaf springs, but they are still the standard springs so they may bottom out under load......one thing to consider. If you don't load the car up then it doesn't matter.