handheld shower from spigot with wall mount bar

I have a shower assembly that Ace used to make but has been discontinued. Anyone know were I can get replacement parts?
Spigot comes out of tub (2 separate hot/cold knobs not included in set).
Shower hose attaches to side of spigot, other end of hose attaches to shower head. Wall-mounted bar allows shower head to slide up and down for height adjustment. There's a square collar that slides up and down the wall-mounted bar, and has a plastic peg on it that the shower head hangs on. The plastic peg assembly is what I need -- the peg broke off the sliding square collar. thanks for any help...