CAT 825 Retainer Plate Cat Part Number 3S3225 To Suit Cat 825 The CAT 825 Retainer Plate is designed to bolt your RP-050-R ( 3S3228 ) Reversible scraper tyne to RP-100 (2V7985) weld on finger. Roller Parts Australia not only stocks a wide range of CAT compactor GET but we also have a range of services, Including brand new wheels and sleeves, refurbishments / rebuilds, frames and compactor conversions.