BG shape but similar, I had a spare (old and bent) hatch which I could make template from
Step one - choose wing (see rafters)
Step two - clean area with appropriate Alcohol solution (IIRC Isopropyl)
Step three - DRILL! expect 5x holes - depends on wing
step four - apply sealant I used Windscreen goo
Step five - bolt up and plug in High stop light
a few steps missed out - make template and some fun language and a reamer might be needed it light plug dont fit hole 1st time
Jared