Source for rubber hatch stops

[sb in gp]

Under all my hatches is a rubber stop that is mounted on the head of a bolt.  All of them are disintegrating and need to be replaced (probably about 20 on the boat).  I reached out to Tiara, and they have them for about $5 each.  That's a lot for a small rubber stopper.  I've attached a picture of the part from Tiara.  I just need the rubber piece, not the bolt.  Does anyone have a source for these, or an alternative?

Thanks,

Scott