Put the grommets in first, then slide the bar in one side far enough to pull it back into the other side.
Also found at
http://www.shop.afpimaging.net/BUSHING-SNAP-HEYCO-SB-1093-14-0000030517.htm
Well that's two places now
http://www.monstermarketplace.com/bath-pool-and-spa-parts/gromets-for-1-diameter-towel-bar-set-of-two
http://www.uspartscenter.com/towelgrabbar.aspx
I know this is an old thread, but did you ever find those grommets? I have the same issue and found one other person who in the last two weeks has the same problem on a different forum.
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