RX8 seats into a 1986 military D90

Dear All, as title...I've bought a set of near mint leather RX8 seats to fit into the 90. Was going to add a set of MUD seat raisers but it transpires the raisers don't work with our seats runners as these are the screw type fitting, not the nut/bolt type. Has anyone else come across this before?

My thoughts are to buy a set of later/civilian runners to proper install...or, is there another way that you may have found?

My rx8 seats just have 2 pieces of angle iron , one is welded to the rx8 seats the other is bolted to the seat box (wider) then the seats angle iron sits inbetween the seat box angle iron and has two bolts each side going through , if that makes any sense, can also tint the seat back by undoing the front two bolts