Does anybody know what seats interchange with my 1970 521 pickup?

do you have any pics of the mounts? for some reason i feel that most datsuns have the same seat mounts but i'm not really sure... if they are there is a lot of possibility of swapping out a lot of different seats with only little modification... and some that don't need any

I know that Mazda b-2200 seats work well in 620's, but I never had good luck with other seats in my 521's. The cabs are so small, other seats just take up too much room. Worse still, stock seats tend to be weak. I had to have mine re-sprung and re-covered. I had a friend going to Wyotech, so It was about $80 for materials. I have no idea what a real shop would charge. I shudder to think...