Both mine are screwed. One doesn't retract other one is sticky and won't unwind. Trying to get the two over the pits and I know they are going to pick this.Cheers,Tom
 

Might be tricky to find. I believe technically it's illegal to sell used seat belts but finding any at all is probably the bigger issue. Someone mentioned somewhere Toyota has a "life time warranty" on seat belts and will replace worn out ones but it does sound a little to good to be true tbh. Might be worth a shot though.
 
Otherwise check with either of these two. The prices usually justifies the shipping from the UK in my opinion:
http://www.mr2mk1toyotaspares.com/
http://mk1mr2.webs.com/

i have a pair of used belts i took out of a jap import recently. i'll check them today. i can still supply new ones and i can also get your re-webbed and recertified