Hi Mark I have a new one for my TA but I can’t get it to seal as well as the octagon cap, I shall be keeping it and trying it on the F2 when finished. Good luck. Bob
I have a Bonora Radiator Cap purchased from Vintage MG Parts for 125GPB which is not now required. No patina but you could de-chrome it if required. Purchase would be plus postage from New Zealand.