As said anything is possible. What you have to do is...separate the both sets of runners & marry up the Coop ones to the said seat that you wish to fit & weld them on as central as possible. Without seeing the differences in the tracks, you may have to fabricate some extra fixings.
Realistically with the right equipment this could be done quite easily.
Adaptor plates 3" steel. New seat can keep its runners that way. Make them yourself. Bolt plates to existing seat holes in floor then bolt new seats to these plates
