aftermarket, might not be as good but still an option:
Spareto - https://spareto.com/products?utf8=%E2%9C%93&keywords=4867426040
mag engines, partsouq list it too but they may also cancel when you try to order.
sometimes amayama cancels something, and then you just order it again next week and it goes though.
somtimes it will be unavailable with the overseas parts sellers and then the local dealer can get it.
looks like 1st gen MR2 bushings and their are still interest in those cars. Can prob reuse the washers if they arnt available.
I own a shop and I totally get turning down the job. I would make way more if I didn't work on older cars/trucks, the majority just want them fixed as cheap as possible. Also there is alot to go wrong, something completely unrelated can break on the car while it's at the shop and the customer expects it to be fixed for free... and then their is the parts problem. Current old diesel car in the shop was shipped to me from Chicago because nobody their would work on it.