expected the final bits to be easy

:angry:
1.
The windwings do not fit because the side mirrors are in the way. I have now reversed the mounts and with some trouble the wind wings are on. Am I doing something wrong? I followed the instruction in the manual when I drilled the holes for the mirrors. Any suggestions?
2.
Gear gaiter ring. The tunnel has a rounded shape, but the gaiter ring is flat! Before I bend the ring to fit the tunnel: any better suggestions?
3.
Boot rubber. The gas strut mounts in the boot are just on the edge. To attach the rubber I need to cut out a bit to make room for the mounts. Before I do something stupid, is this the way to go? Or did I mount the gasstruts the wrong way?
Thanks for your help!