Decided to get some grommets for my shell top today and didn't want to spend the money ordering them from a wurli specific company. I had some #10/32 ss machine screws that I trimmed down to just under 1 1/4, and had ss flat washers and lock washers that fit as well....and that made for a pretty complete hardware package for the wurli top aside from the grommets.....
I found that 9/32 size rubber grommets from the hardware store fit perfectly and were just about $1.00 a piece. Figured I'd pass that along since there may be someone else in the same boat.
Happy tinkering!