I posted before looking for replacement inserts for my Stern Lightning to no avail. So I decided to go a different route... First I found a website that sells colored plexiglass at 1/4 inch width ( not many providers out there). Ordered a 12x16 inch sheet of blue transperant plexiglass, then traced around the original inserts and cut them out with my dremil tool leaving at least 1/8inch excess around the lines. The first set I tried hand sanding down (long miserable failure). Then I went out and got a 1inch x 30inch belt sander from harbor freight for $32 with coupon, and tried again.
This set came out very fast and easy ... took my time sanding down going back and forth from the game to see how it fit. The end product fits extremley tight and good ... dont know if I even have to glue them in?