Very strong silicone that support the metal sement that I have put in the two oil channels. Looks ass, but it works very good: Not my car, but got a set off ABT sideskirts in the mail today. The oem skirts are shit, and Ive been driving around last 2 years with 1.5 sideskirt Federal RSR street slics 215/40-17". They are in the same league as R888s, but alot cheaper. At least here in Norway, wich is the worlds most expensive country. UM oilcooler bolt. Do I miss something here? The end cap is not even close to fit.........