a columbarium includes a plurality of niches configured to store cremated remains . temporary stone cover panels mount to the front of the niches and panel retainer assemblies , each having a bracket mounted on the back of the cover panel ; the bracket having an orifice formed therein . a retainer element has an engagement portion extending through the orifice of the bracket and projecting from the bracket . the retainer element is supported on the retainer element spaced apart from the cover panel and extending along the back of the cover panel . a spring engages the bracket and the retainer element to maintain the retainer element in position . the temporary cover panel is compared to the permanent cover panel and the spring - loaded adjustable hardware of the temporary cover panel is released and the position of the spring - loaded adjustable hardware of the temporary cover panel is adjusted to match the complementary hardware of the permanent cover panel .