Yorktown replacement rear plastic rail bracket

Would you kindly recommend a replacement rear bracket holder from circa 1997 Yorktown cabinets with the plastic bracket number on item G6600. Length out-to-out 2 1/4" by an inside opening for rail to insert approximately 3/16th. Actual out to out width varies due to designs and allowances for multiple hole for screws. I am willing to pay for a possible recommended solution of yours. Local box stores had nothing close to my needed solution to replace broken plastic bracket supporting rail.