Can you post a photo of the pipe?
I have searched every combination of DR/SP/DRM/RMH Specials looking at the best combinations of seats, tanks, exhausts and side covers to get it looking just right,
The best looking is the TM125 tanked RMH,
But the late RN tanked 500 is the most period correct,
Still not sure on frame covers and exhaust, I have several Supertrapps and reverse cone megs just not entirely happy with any yet.