Sand & Gravel Process Equipment, Parts Dealer | RB Scott rb scott, sand, gravel, process equipment dealer, wear parts dealer, crush stone, frac sand Parts . RB Scott Company, Inc. has an extensive inventory of parts and accessories for crushers, screens and conveyors. Metso brand crusher spare parts and crusher castings are found in our inventory. In addition to just offering a part, our experience will assist you in the proper selection and application.