Perhaps the look is not 100% the same as Dunlop wheels (I saw Limora wheels as well) but you should get every size and every offset etc. made to your individual requirements.

https://www.imagewheels.co.uk/billet-46-alloy-wheel/

I am not sure but I think MMC has ordered those 4/4 80th anniversary wheels by Image, at least it looks like.

https://www.merz-pabst.com/morgan/modelle/4-4-80th-anniversary/

'14 4/4 graphite grey