YT3600 mower deck belt length?

[John in Pa]

Could some tell me what the correct length or part number for the deck to PTO fanbelt?  A long story, but i had made my own mule pulley system for 5 years and finally bought a real one.

Thanks

[cr250]

B109

[John in Pa]

I did some looking around looking around and found that LB109 equals a B106.
Here is one that I found

 Replaces OEM:

REF NO: B106
YAMAHA: LB109
 
Specs:
Width: 5/8 "
Length: 109 "