The sliders for the ends of the spring with the correct rectangle protrusion which fits in the rectangle bulge on the spring ends are available from EATON for about $1 each.... I think the min order is $20.

Are any of you readers familiar with DAYTON Springs. They are a large mfg of springs and reproduction OE leaf springs.

Probably no way of learning if DAYTON mfg the private label springs for all the mentioned vendors.