First you should log in here so everyone knows where you are located to be able to suit you better
Second you should try to obtain a motor frame croos reference chart or book
Third is that particular motor frame designation NEMA, IEC, or Metric , I ask because I had a Shultz DC motor die on me last month witha frame designation of 103 (which didn't show up on any chart I have) I was told it was a discontinued Metric frame style
But if you are in the US (or can order from here ) there is a web site called
www.wireandplastic.com and they have 4-6 different warehouses across the US full uf new, used, refubished equipment and motors. I use them all the time when I loose an older setup for my plant.
And what is wrong with you motor that it can't be rebuilt???
I have seen some real bad stuff happen to all sorts of motors and as long as it can be disassembled it should be repairable
Hope this helps
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We cannot solve today's problems with the same level of thinking the created them---Albert Einstein