A gas turbine engine system comprising: an engine casing; and a compressor (14, 16), a combustor and a turbine (20, 22) 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 (14, 16), a combustor and a turbine (20, 22) 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.