Went through my manuals. Only one I found with the YQM-48 mower has the YM165 and YM165D as the primary....inside the cover it says it will also fit a YM186 and YM186D, also a JD 650, Satoh Beaver III, etc.
Also says "and many other compact diesel tractors with 1 3/8" SAE 540 RPM PTO and Compact Diesel CAt 1 3-point hitch"
The other 2 manuals I have showing the 135 and 155 are for a YMM45 mower deck.
Hopefully some of the other yanmar guys will be of better help.