I don't have the rennlines, but I do have the Wevo trans mount version. My tip is very similar to Gilles, when installing, don't tighten everything up until you get both sides on, and for me, that included the center nut. There is plenty of room to get a wrench up top to do what you need, and I think (but can't confirm) that I was able to get a torque wrench on everywhere.
I don't know which of the rennline inserts map to the default wevo, but I really liked the wevo. At idle, there is a little more vibration which my camera mounted to the BK bar would pick up, but once you are moving and off idle, it goes away. I bought a second set to put on my Cayman but haven't gotten to it yet, I may try to do it as a corona project
