First with even those pants a snake can crawl up them. I know I had one this summer that went up my work pants leg before I could move out the way. I was laying under a mower at the time and it came out the frame. I was lucky that it was a non poisonous one. Still got my heart pumping rather fast.
Bert you just got to know how to read the serial number posted. As the tiller is a model 33 Tractor-Mounted Tiller.
And yes I am on a different planet. It just in the sweet spot of Earth orbit where you cant see it. Here is a map of Torland.
Here is the JD model search results.
The reason you not finding the part as expected it is a supersede PN of the original PN AM31705 that was superseded to AM34985 and then superseded again to AM118473 which requires bushing PN N189096. It also can be replaced with JD PN AN152951 but overall OD is just 3.25" and with 2.75" flat diameter.
Oh well got to go to work as it is now above freezing here. I got another crappy Chinese clone engine to figure how to fix since the OEM doesn't provide repair parts. Doesn't help when the customer has taken it apart. Spend half a day putting it back together just to find out what is wrong with it.