rubber mounts
Mk3 exhausts comes with hangers that are side to side and not all mk2's have this style as some hangers point front to rear (50/50 mix)
The floorplan being a facelift really has the same floor mounts for both models so it's easily fixed with a couple of mk3 mounts
Genuine are as always expensive and hard to get old of but there are aftermarket alternatives available from Bosal (they make the original Seat kit anyway) but check/ask your local motor factors/exhaust center etc who the local bosal supplier is or even ask any local supplier to cross reference the info to
help
Standard fitting for a 20vt box to a 16v (same bore size 55.5mm, other engines will need adapters) use a couple of 255-046 and the twin rear pipes will sit just touching a standard bumper and some cut round them others don't bother, purely asthetic in reality plus i can't cut straight to save my life
When you get it all fitted and stand back to admire your work don't be too surprised to think it's on the piss, it's not you it is, even standard they always have been with twin pipes even the early Leon's (look at a standard one next time you see one
)
The second rubber (255-146) fits the same and is shorter and can be handy with aftermarket fitting of some custom exhausts so if you get it hanging too low this is an option that will
help.
and as said many time elsewhere if the rear exhaust hits the susp beam or the front pipe hits the floor then it's not aligned properly, the easiest way i find is to setup loose with the hanger for the middle box vertical and then go from there - can be a right pain too at times so must be those german tolerances huh