We used Mier's racing spoiler/endcaps on our 65. If you do a search on my user name you will find a write up i did on fixing one problem we had. As ARPM said a lot of work will go into the end caps. the problem I wrote about dealt with the deck lid. We did not have any warping, (other than the back of the spoiler was not straight) but when mounted, we had a nice gap on the passenger side, but large, .5+", gap on the driver side. Additionally, there were a significant number of large voids under the gel coat, some as long as 12". I added ~.25" to the driver side. Their isn't any FG that works well. On our FG Shelby hood, had a reasonable fit to begin with. After painting, the hood was off the car ~ 1 year. When we remounted it, it had bowed on the sides ~1" and across the front had warped about the same. We ended up making an all steel hood with a steel shelby scoop (also on another post with pics). In the end we spent just a little more $ on the steel hood than the FG version when shipping is considered, much less the anoyance of having to redo and delay.