ID this main cluster from a mystery tranny

[Wogden]

HELP! I was contacted by a fella over in Norway that has a 37 large Buick tranny all apart and is looking for parts. After looking this over it appears that it has had some mods prior to his ownership that leaves us somewhat confused. For starters, he needs a cluster gear and a 1st/reverse gear but after looking at the main shaft assembly we found that the syncho has the same size cones front and back which is not what a 37 has. In comparing his shaft to a stock 37 that I have there is a lot of differences. The input shaft seems to be the same length as a stock unit but the cone is larger to fit the synchro in the pic below. So am throwing this out there in the hope that someone can offer up something of value. I have contacted Dave Tacheny about this but have not heard back from him yet FWIW.