Took me about an hour this evening to fit the Trutrak roll servo. There's no specific dimension for exactly where is goes in the fore/aft direction (though its actual size more or less determines the vertical position). I had to remove one rivet in the seat floor rib/angle, but accidentally removed the wrong one first. Oops! I haven't yet decided whether to use Cherrymax rivets (which I would need to buy), or just go with solid AN470s. Either way, it probably won't get done for several weeks as I have a very busy work schedule ahead of me over the next couple of months (I found out earlier today). Eagle-eyed amongst you will notice a small hole in the top corner of the bracket; there is a small crack developing there, so I have stop drilled it. I shall keep a very close eye on it in the future.