On my 79, I kept the sliders from the stock seats, then made brackets that bolt the seats to them. That way they bolt to the floor easily and still slide back and forth. My seats are from a 1st gen. MR2.
[quote author=bad_religion_au link=board=1;threadid=5934;start=msg51443#msg51443 date=1066277464]
my 1980 45 troopy (similar tub structure to 40's of same age) run toyota crown seats (don't know if you guys get them) with some custom brackets fabbed up
a friend with an 83 40 said celica seats are basically bolt in, don't know exact details
the last Crowns we got in the US were late 1960's, here is a local one owner 68 Crown, not sure if these seats would be an upgrade