Thanks for the photo!
Visited Coastal, didn’t see Stowe, no help.
Have since sent photo to Maule direct, my tw assembly (not the wheel) appears to be a pre 1976 tw.
Cap is not available (I found a plastic temporary one atm) sizing now different.
The cap is presently the only requirement, as you say the locking bearing and pins etc are the same for mine.
The internal main bearing (when it gets worn) will be required to be made here in a lathe shop.
Aircraft Spruce show the breakdown of parts, and they also confirm no caps available.
I am currently talking with a mate who rebuilds old cars, 1.25 inch grease cups may be coming! ?✌
Thanks to every one for your assistance!