Thank you for choosing Aerospace-Aviation360 for Part Number RFS4050 by Beechcraft for model King Air 200, 300, 350 which is described as Back Plate . This is an ASAP Semiconductor owned and operated website. We are a leading supplier of aircraft Corporate Brake parts like RFS4050. You have 24/7 x 365 access to our diverse product database with the fastest lead times in the industry.