Upper left and right part: 5-5/8" x 4-7/8"; Lower left and right part: 5-1/4" x 5-1/4". Set of 4 Corner caps for Slide Outs - Suitable for many Gulf Stream units including: Endura. The part is attached with a strong adhesive tape. Original Part Number for lower left and right part is 646d-08t443.Original upper left part had a "LR" mark and original upper right part had a "LL" mark.