I have a KDI DE filter 48 SQ FT Model NO. 584090, Length 22 IN, Width 22 IN, Height 52 IN. I cleaned the grids last season and during the process noticed they were not in good shape. I am considering replacing them all including both manifolds and was wondering if the grids/manifolds are generic for all 48SQ FT filters or I have to look for specific ones to fit. Any guidance or recommendations will be greatly appreciated.