If you think there are problems with M.20 exhaust pipes and silencers just try some of the replica offerings for WD 16Hs. I don't think I have ever seen 2 pipes the same and the problem is enhanced by it having to fit to two securing points as opposed to the one for an M.20 pipe. As for the WD 16H silencer I haven't seen a replica in the UK that was even close.
Of course I may not be looking in the right place so if you can please put me right - I would be most grateful.
My last and final dealing with Armours was years ago and I will never buy one again!
Two complete system were ordered, one for my 1961 Triumph Bonneville and one for a Norton Commando. Neither one could be made to fit. They were not even close. The front mounting brackets for the Triumph were off at least an inch and would have required removing the chrome to move the brackets to the correct place. One the silencer was fitted, its mounting brackets were in the wrong place too.
A friend of mine ordered a Velocette system and it was impossible to fit at all unless you left the foot rests off the bike.
I don't know how they remain in business when everything they make is crap!