Need help on 38" mower deck
 

I've restored my Standard Model 38" mower deck and am ready to attach it to my CC 100. I've looked at the CPE-2B and can't figure out if I need the 478 881-R3 mule drive belt or the 473 462-R4 belt. How do I tell which one I need? Also, just to double check: is the 473 468 R2 spindle belt the correct one for my three spindle deck? A picture of the mule drive (before restoration of the 100 - mule drive is on the left of the picture)

Pics of the restored deck attached: