I have the above motor and I picked up a used 5" extension kit. The kit came with instructions but I think it's missing a parts. Kit number 392002. Step 15 of the instructions says to install O ring in the groove at the top of the driveshaft. It did not come with this O ring and I was wondering if anyone has a part number or a size? I have tried to look on the BRP web site with no luck.

Thanks in advance.

TimD