A gas turbine engine system comprising: an engine casing ; and a compressor , a combustor and a turbine housed within said engine casing , the system further comprising: a receiver formed on an inner wall of said engine casing and configured to adapt a curved surface of said inner wall of the casing into a planar surface; and at least one slider seal assembly mounted to the receiver , wherein the at least one slider seal assembly comprises: a housing comprising an outer surface and an inner surface , and a recessed opening between said inner surface and said outer surface , wherein a first opening extends through the housing and opens into the recessed opening , wherein said inner surface of said housing includes a flat portion configured to match the receiver on the inner wall of the engine casing ; a seal plate comprising a second opening extending through said seal plate , said seal plate being received within said recessed opening and moveable relative to said housing ; and a retaining ring configured to retain said seal plate adjacent said housing , said retaining ring includes a plurality of tabs configured to retain said seal plate within said recessed opening . an engine casing ; and a compressor , a combustor and a turbine housed within said engine casing , the system further comprising: a receiver formed on an inner wall of said engine casing and configured to adapt a curved surface of said inner wall of the casing into a planar surface; and at least one slider seal assembly mounted to the receiver , a receiver formed on an inner wall of said engine casing and configured to adapt a curved surface of said inner wall of the casing into a planar surface; and at least one slider seal assembly mounted to the receiver , wherein the at least one slider seal assembly comprises: a housing comprising an outer surface and an inner surface , and a recessed opening between said inner surface and said outer surface , wherein a first opening extends through the housing and opens into the recessed opening , wherein said inner surface of said housing includes a flat portion configured to match the receiver on the inner wall of the engine casing ; a seal plate comprising a second opening extending through said seal plate , said seal plate being received within said recessed opening and moveable relative to said housing ; and a retaining ring configured to retain said seal plate adjacent said housing , said retaining ring includes a plurality of tabs configured to retain said seal plate within said recessed opening . a housing comprising an outer surface and an inner surface , and a recessed opening between said inner surface and said outer surface , wherein a first opening extends through the housing and opens into the recessed opening , wherein said inner surface of said housing includes a flat portion configured to match the receiver on the inner wall of the engine casing ; a seal plate comprising a second opening extending through said seal plate , said seal plate being received within said recessed opening and moveable relative to said housing ; and a retaining ring configured to retain said seal plate adjacent said housing , said retaining ring includes a plurality of tabs configured to retain said seal plate within said recessed opening . <EOS>