I am still trying to put together stuff for a friend of mine in Europe to fix up his 1951 3 speed transmission. I'm sure he has the 2 lug rings. I have 3 of the 4 lug synchros, but no 2 lug. I picked up a pair of 591087 2 lug rings on eBay today. Has anyone trying tried putting the 2 lug rings in a 4 lug housing? I am thinking about building him a transmission and taking it along a checked luggage later this year. Delta allows 70lb bags in first class.