How come you've got 4 top mounts Mike??
Word of caution when you put the RS3 vents on...don't put it on full lock while its on axel stands. trolley jack or in fact just in the air, I was doing something last week and noticed a cracking sound and when I looked the passenger side vent has a piece missing from the top of it
found it on the floor so will glue it back on or buy another.
Darren