Planenut is correct. That’s a Kuryakyn Mach 2 filter and it needs support lugs fitting between the filter back plate and the bosses on the pots. There’s a chap called Emil at

https://www.morgancustom.net/custom-accessories

That makes a set for $75.00.

By the way you have two M3W owners not far from you in NE Hants, one being me, the other is “Number 42”.

M3W Brooklands (2015)
Moody 41 (2013)