As I recall they are supposed to come with a couple of metal brackets. I bought one on ebay and it didn't have the brackets, and I even contacted TCP but they no longer had any. I had a friend make a couple up for me, but didn't like the look of the cowl so sent it back to the seller as it was not complete and couldn't be fitted without the brackets.
I don't know if I still have the brackets we made up, but I'll let you know if I have and send them to you.
Don't hold your breath though, if I do have them it will take a while to find them!
Sorry I can't help more but I will try.