Hey there.
I make up the drop tanks 4 the 1200 coupes. I put the R31 pump in the tank and it all bolts up the the oringal mounts, filler and breather. No need to cut up the floor. When u use the R31 tanks in the coupes u need to modify things and they hang low. My tank holds 60 liters. I can make u one if u want?
Heres a photo of it on my car
Trent