I have a 2H.P. 2-cycle, gas front tine Chain Drive Tiller, around 17 or 18 yrs. Old. I need a replacement

A replacement pulley-chain case with no. N756-0287. Tiller Model No. is 247.298521. Where can I buy this

Part of my tiller?

Hi,
This tiller was made for Sears by MTD. The part breakdown is online and the MTD part #04924A is the chaincase complete. The model is from 1991 and one place to get the parts breakdown is:
Owner's Manual - CRAFTSMAN Rear Tine, Gas Tiller 917294482 - ManageMyLife.com
Peace,
Clarke