Channels for seat springs.

[Terry, NJ]

Anyone know where to get the channel strips for seat springs? I don't know the actual name for this part. They're used on the coils of the seat springs to hold them in position. Snyders is making them out of aluminum but they're not being offered for sale. It's a steel/aluminum strip that's folded over but not closed. It gets crimped over the spring coil. A very cheap and simple part to make, but I can't find them anywhere.
Terry