Would like to buy a back plate for a 102 W20 spindle...

Hey guys, I have a Schaublin 102 with the W20 spindle on it and the lathe came with a 3 jaw chuck that is not in very good shape. It is on a shop made back plate (made by a previous owner) and once I checked it out I realized they just cut sae threads in it and it doesn't match the spindle. I have a line on a really nice Buck chuck but I want to put it on a new back plate. My other lathes are not able to cut metric threads and I am not real interested in converting one to be able to make my own.
So, anyone out there have a back plate that I could buy? Literature says the thread is M37.6 x 3 , I'll include the dwg.

The Buck chuck is 3" diameter if it makes any difference.

Thanks,
Jason

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