replacement cover:covers alum coping and locks down for overlapstyle w/bead line

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Sierra liner pool built in 70's in northwest suburban chicagoarea. Sold thru Norberts. aluminum coping attached to top of wall. the cover is what i'm looking for; white plastic extrusion some ribs on surface snaps down onto coping and appears to also act as liner lock. Coping is aluminum and is rises about 1 inch above top of wall.the pool edge of coping has a channel bead receiver that is verticle instead of traditional horizontal track. this cover has a bullnose and then a recess to fit over bead receiver channel. there is also a barb or hook to catch another part of the coping for a lock. this cover is installed then the deck is poured to it