Sent my fuel pump & a couple old axle bumpers to Thenandnow in MA. They did a beautiful full rebuild on the pump right away, said it would be longer on the bumpers.
They modified an existing mold and just got them done and did a really nice job. Bumpers are now supple as new compared to the old ones which were about the same consistency as white pine, even the NOS single I have was very stiff. Pictured are a later type, rebuild and and very early '52 type. New one is 1/16th taller than early '52, 3/16ths shorter that later type.
Not cheap, $99 for a run of two.