I recently used one off a very late normal Sierra with pas. It required slightly modding due to it being slightly longer, just two min with a hack saw to lop off a bit fromt he end....apart from that it fitted straight in and also it has the rubber coupling mounted slightly further down..which is great for me as it moves it away fromt eh T4 heat

The grpA coupling was a solid afair with no rubber joint...maybe an engineering firm could make you a sandwich plate the right thickness out of steel? It may creat a slight amount of tizz thru the wheel at high revs but cant see much else being a problem??