2019 Rancher 420 Maintenance

I'm coming up on 100 miles and the glove box book and the Helms manual both say check the valves. Or, I guess it's I for inspect.

I'm planning on doing all my own work so I don't intend to take it into the dealer and have them charge $500 (or anything) and then check the valves by listening to it.

However the book says replace the o rings around the 2 adjustment ports or holes and where the top dead center is observed.

I went to the dealer and they only could get the two end ones and then it would take a week.

So I need, as I needed anyway, to find a Honda ATV discount online supplier.

I know they are out there for Honda cars. I can get car parts sent to my door with a discount that, after shipping is less than the dealer will charge.

Does anyone have a parts supplier for Honda ATV parts. The nearest dealer to me is 50 miles each way, and they seem to have no parts in stock (unless that is their way of steering people into their service department.)

I probably don't really need to replace those o rings, but I'd like to have them around for when I do.

Thanks
dc