C23808 Belt from deck to PTO on tractor:   

For early Onan Powered Ingersoll  4016, 4018, 4020 drive belt for RM38, RM44, RM48 
 
The belt for 646, 648 series loaders with deck models J44, J45,  K44, K45, J46, K46, M44, M46, N44, N46
 
Used on most Onan powered early model big wheel 4000's series 4016, 4018, 4020 series Ingersoll tractors with right-hand discharge RM 38, RM44, RM44GR, RM48 decks. NOT FOR 60-inch decks
 
INGERSOLL MODELS, PLEASE NOTE 
This belt originally was for most Onan-powered Ingersoll 4000's series tractors, it was originally for mower decks serial numbers before RM38 010308055, RM44 010307024, RM44GR 010308167, RM48 010307021.  With that being said, these tractors and decks are many years old by now and could have had decks, mule drives or tractors swapped back and forth.  PLEASE SEE THE PHOTOS ABOVE SHOWING THE CORRECT MULE DRIVE THAT USES THIS BELT.
 
Other belt option for late model 4000/4200 series decks after serial numbers above likely powered by Briggs & Stratton Vanguard C44802
 
OPTION-   Upgraded heavy duty belt and save money. Almost all OUR replacement belt models are made in the USA unlike the OEM ones now. We have tested these belts and found that they are not only comparable to the OEM belts that have had a good reputation, but in most cases they actually perform even better and at a savings! Or switch to OEM belt for up charge.
 
OPTION- Add Replacement Tension spring for proper belt performance and longevity!
 
**Picture shown is a stock image of a belt for a Case Ingersoll, not necessarily the belt in listing**