W13-04 2 doubler support plates. 1 of these came with the parts I bought and just needed a clean-up of the edges but for some reason there was only one, maybe it was never made, maybe it got lost. Anyway, I had to make the second one from scratch. Used the first one as a template. Those big oval holes are always a challenge, you can't drill them because they're not round and too big for a drill. I used my dremel tool with a router extension, works alright but as I found before, you have to hold the dremel tool quite well and be very carefull not to let it get away from you.
