These 1/4″ ID fiber washers are priced like gold nowadays. Substitutes are difficult to find. Rebuild kits online usually substitute washers made out of cork sheeting. If you have a punch set, they can be made. If memory serves, some make them out of acetal.
Home Depot carries 1/4″ ID x 3/8″ OD fiber washers in packs of two for $1.15. These are only about 1/32″ thick whereas the originals are closer to 1/16″ thick. The solution is to use 2 washers per screw. This has worked for me. Total cost is under $10.00. Hope this helps.
https://www.homedepot.com/p/1-4-in-x-0-032-in-Black-Fiber-Washer-2-Piece-807908/204276417
Improvise-Adapt-Overcome
