Bottom, 1-1/4" H. aluminum window frame to make replacement inserts that will operate in most main frames of triple track channels. Use glazing vinyl model No. P7741 (Sku 267996). 72" lengths. No. PL14192 (Sku 269336); Mill, use with top and side model No. PL14189 (Sku 269301) . No. PL14194 (Sku 261727); White, use with top and side model No. PL14191 (Sku 261726).