The rubber donut pieces used on boarding ladders, engine hatches, etc. One of my engine hatch bumpers has deteriorated so I need to replace them all probably. And the swim platform ladder could probably use new ones while I'm at it. It'd be nice to find them in white or clear. Thanks.

mcmaster carr

lowes carries a big selection in the hardware section. They have a lot of hard to find automotive type stuff.

Try Mcdonald Hardware on SR84, they seem to have everything.