5T primary chain case numbers

[brad.royce]

Hi there, need some tech advice.
I have a 49 Triumph rigid frame that I am putting a 51 500 motor into.
I don’t have primary inner or outer so chasing them down is proving difficult.
Correct numbers for the 51 are T483a inner and T480a outer.
Are there any others that fit this year? I have located at T483 (no a) which is off an earlier model?
Appreciate any advice, this is my first pre unit.
Brad

[Rex]

I seem to recall the contemporary 3T case is different.

[brad.royce]

I've been told that anything pre alternator from a rigid frame will fit? Not a lot left in Australia so don't want to fork out big money for something that won't bolt on. The bike isn't matching numbers so not requiring exact year.
Brad

[33d6]

If I remember rightly the 3T frame was smaller than the standard frame which led to it being used on the early Trophy. I can remember a mate going on ad nauseam about this as he built up a 3T which he assured me he would eventually build up into the definitive Trophy.
He only built the 3T because he got the engine at a knockdown price. 3T’s were viewed with contempt back then. Trophy engines were a lot dearer so he never did do the changeover. Toms wallet never came out in daylight anyway so none of us were surprised.
So, Brad I’d check what frame you have before leaping in.
Finally, I don’t know what part of Oz you live in but all this happened down in Victoria. No problem getting Triumph stuff then.

[brad.royce]

I’m in Westrn Australia. Plenty of unit stuff around but pre unit getting tougher.
My frame and motor are both 5T.
I can find some cases but I can’t get a definitive answer as to what will fit.