A system for a gas turbine comprising: a slider block (204; 510) configured to slide along a slide track of a convergent nozzle and defining a first slot (402; 500) having a first outer distance and a first inner distance that is greater than the first outer distance; and a composite wear pad (300, 306; 520) having a first axial end having a first end thickness that is greater than the first outer distance of the slider block (204; 510) such that the composite wear pad (300, 306; 520) resists axial separation in response to the first axial end being positioned within the first slot (402; 500); wherein: the slider block (204; 510) further defines a second slot (403; 501) having a second outer distance and a second inner distance that is greater than the second outer distance; the composite wear pad (300, 306; 520) further includes a second axial end having a second end thickness that is greater than the second outer distance of the slider block (204; 510) such that the composite wear pad (300, 306; 520) will resist axial separation in response to the second axial end being positioned within the second slot (403; 501); and characterised in that: the composite wear pad (300, 306; 520) is replaceably coupled to the slider block (204; 510) and positioned between an outer surface of the slider block and an outer surface of the slider track, when installed. a slider block (204; 510) configured to slide along a slide track of a convergent nozzle and defining a first slot (402; 500) having a first outer distance and a first inner distance that is greater than the first outer distance; and a composite wear pad (300, 306; 520) having a first axial end having a first end thickness that is greater than the first outer distance of the slider block (204; 510) such that the composite wear pad (300, 306; 520) resists axial separation in response to the first axial end being positioned within the first slot (402; 500); wherein: the slider block (204; 510) further defines a second slot (403; 501) having a second outer distance and a second inner distance that is greater than the second outer distance; the composite wear pad (300, 306; 520) further includes a second axial end having a second end thickness that is greater than the second outer distance of the slider block (204; 510) such that the composite wear pad (300, 306; 520) will resist axial separation in response to the second axial end being positioned within the second slot (403; 501); and characterised in that: the composite wear pad (300, 306; 520) is replaceably coupled to the slider block (204; 510) and positioned between an outer surface of the slider block and an outer surface of the slider track, when installed. the slider block (204; 510) further defines a second slot (403; 501) having a second outer distance and a second inner distance that is greater than the second outer distance; the composite wear pad (300, 306; 520) further includes a second axial end having a second end thickness that is greater than the second outer distance of the slider block (204; 510) such that the composite wear pad (300, 306; 520) will resist axial separation in response to the second axial end being positioned within the second slot (403; 501); and characterised in that: the composite wear pad (300, 306; 520) is replaceably coupled to the slider block (204; 510) and positioned between an outer surface of the slider block and an outer surface of the slider track, when installed.