AvantiRich

I'm trying to find a replacement slip yoke for my original TH400 tranny. I believe a C3 'Vette 68-81 used the same quick-change slip yoke, but I can't find dimensions for that part number anywhere, "CA-41277". Anyone know it this is a good replacement or know of another one? Most I've researched are longer than the 5.5" (overall) unit in my car now (pic attached).