TR6 rear light support assembly (stainless steel)

Good evening,
I’m new to the sight in terms of usage and wondered in doing so I could use the power of SM to help me secure/find/locate/purchase and new condition ‘near side rear’ tail light mounting bracket

I truly don’t want fork out £400 plus but would consider a sensible figure for the best condition piece on offer…

Any suggestions would be gratefully received- thank you for your time.
All the best - Steve