I have to find drawings, please wait a sec...
BTW. they are the same length...
Found the drawing (in dxf format - you can open it in
LibreCAD, v 2.13))
There are some funny issues in the drawing - consequence of conversion from ACAD (dwg) to dxf format, but the drawing itself is reasonably accurate, you will not have any problems with dimensions.
According to my notes (from drawing), belts are:
176mm
88 teeth
B-G2-88-060-NF
A 6R51M088060
I also made new motor plates (as per drawing - there was a problem with motor height and shaft length) and some machining on pulley was necessary to fit it in.