I just replaced the carburetor on my '93 Harley FXR with a Mikuni. The backplate for the air filter wouldn't fit as the Mikuni adapter was designed for the stock Harley bolt pattern and I wanted to keep my previously made cover, so.....
Front side (Sorry about the flash glare)
Back side with Mikuni adapter installed
Backplate installed on bike.
Installed with cover
I hadn't wiped the fingerprints off when I took these photos so excuse them please.