chorbs

My rear sway bar bushings are worn and noisy. When I spray them with lithium grease they are quiet for 2-3 weeks then the noise returns. Someone replaced them at one time with Moog "problem solver" bushings. These are the only bushings that I can seem to find. I would rather use a different brand of urethane bushings. The bar is 22 mm ( I measured it and checked online for the size). I can only find 20 mm and 24 mm for the 12 V6 Mustang. Does anyone have the part # from Energy or Prothane or other urethane bushing that is 22 mm and fits the base V6 Mustang? Or even the latest Ford replacement # ? I know ford changed them a few times because of noise. From what I hear, this is a common problem, but I can not seem to find the proper bushing. Any help would be appreciated. Thanks in advance!