Ha!Really
Feckin
Tight
Nice set of RGM roses now in the For Sale forum:
https://accessnorton.com/NortonCommando/rgm-stainless-exhaust-roses.27711/
I guess that you have looked into machining you LHT rose nuts down to threaded sleeves, then reduce the od of the threaded section on your RGM rose nuts. Press on the LHT sleeves and braze or weld in to place ?