Sprint Looking For The Correct Part Name Or Number

Hi

I'm new here so sorry if this is a dumb question. I have a 2011 Sprint ST1050 with full Panier set. THere is a metal Spacer (or maybe Link) Bar that balances the Paniers. It is a free sliding bar that with a spherical plastic end piece on each end that separates the Paniers. One of the plastic end pieces has fallen off whilst riding so I either need a replacement end piece or a replacement bar assembly but I don't know the correct name to find the correct part (photo provided). Any advice would be greatly appreciated.

Thanks

Kol