Designing Kitchens and Bathrooms - Looking for a part for an older shower/tub

Not sure what to even call it. My tub/shower, probably a fiberglass, is in very good condition but like all other things in the house is reaching 20 or so years of age. This unit has a soap dish on the wall and an aluminum pipe grab bar across it. This bar is held in place with grommets or seals that have become too loose. The slightest touch and the bar falls out so I am sure there is also some seepage.
None of the Hardware stores have anything that resembles the parts I need.
Any suggestions on where I can get the parts or repair? Thought of just putting caulk but would prefer better appearance.

if you don't know the manufacturer of the dish (and, even if you do) - finding a 15 - 20 year old grommet will be close to impossible.... a clear silicone caulk, applied with care - will hold the bar in place.... and won't look bad at all...