Venetian Blinds Valence Clip

Replacement valence clips for my Nien Made Venetian blinds, since the originals were sagging badly, and one had outright broken. This was purchased at a Walmart years ago and I don't have the exact model number handy; just the original installation instruction sheet, which is where I got the brand name.

Current searches (as of early 2019) on Walmart's website bring up Homepointe blinds, for what it's worth. They may or may not be similar.

If it turns out that the replacements don't last al