I recently acquired a model 50146 46" two stage snow thrower attachment with the 18346 adapter kit that I am installing on my 1668 tractor. Other than some rust from sitting, I don't think the blower has ever really been used. The chute needs cleaned up and painted, but I'll get to that at a later time.
I'll add some photos later and hopefully will get some good video when the snow flies this year. In the meanwhile, I have uploaded a copy of the illustrated parts manual here in case anyone else may need it in the future.
The 50146 46" snow thrower was available for use on larger twin cylinder engine XL-Medium Frame tractors, such as the 1668 and 1669. Also used on the 5000 Series tractors such as the 1700 (5017H), 2000 (5020H), as well as the DuraTrac models and Troybilt GTX tractors.