Before I rivet the top skins I installed the pitot tube bracket. I'm probably going to use Dynon or some similar Pitot Tube so I decided to install the ever popular Gretz bracket. I bought it from Aircraft Spruce. I'm impressed with the kit and guality. The tube bracket is polished chrome and is very nice. The plates are square and the cut outs are good. The instructions are also good, but I did use other folk's construction logs to check what I thought the instructions said.
There is a rivet pattern drawing for the bracket plate, but, BEWARE. You gotta use the spar flange rivet pattern for the top edge of the bracket plate, NOT THE DRAWING, then you can use their suggested pattern on the other three sides.