I know that "you get what you pay for", but
at $1.85 ea. with free shipping, they’re tempting for those motors that
I’ll run once and throw on the rack!
The metric seal noted appears to be a good replacement
for the 1/2" shaft x 1" OD seals.
Viton is the best affordable material that is ethanol resistant. They list a Viton seal. The preferred color is brown which they show. OMC used Viton seals & gaskets in brown color to signify Viton. It is normally expensive vs regular (buna N) material.
There are a lot of thing that go into a quality seal, but for this cheap price might be worth a try. I would not put them in the gearcase as there is no mention of the case being stainless steel. Chris P. has tried that & found they don’t last. JMHO
I didn’t click on the order button, but did look at all the pictures. They show different seals, colors, etc. I thought they offered different styles, materials, etc. If they don’t offers Viton material then I’m out! Of course I would expect the price to reflect the Viton cost.
I e-mailed them and asked if they had the seal that you initially referenced in Viton. It took them a few days but they replied that; yes they do….and it is E-bay ID # 322597943990