Take them to any plastic supply house such as Tap Plastics, Port Plastics or what ever and they can whip some up for you quick. I had Tap Plastics in Stockton make me a set of clear ones complete including material, drilling, countersinking and deburring for $25.00 a couple of months ago. Take one of yours down there and they can use it as a pattern. No sweat.
Port Plastics
3191 N. Washington Street
Suite 7
Chandler, Arizona 85225
Ph# 480-813-6118
Fax# 480-813-6183
800-395-7378
phoenix@portplastics.com
Terry