It was this one:http://www.ebay.com/itm/Universal-MPU100-Quick-Release-L-Plate-Bracket-for-Camera-Benro-Arca-Swiss-NEW-/380932337447?ssPageName=ADME:X:RTQ:US:1123
Funny, I emailed the vendor through eBay to say it does not work with the RRS QR clamp and he said the following:
All of our items are fully tested before sending out,
In that case, how about we resend you a new one? Is that OK for you ? Or would you like the refund? we respect your idea.
Sound good so far, so I asked for a refund to which he responded:
""How about refunding half of money and you don't return it to us due to expensive charges?""
I then said, OK, just send a new one like you initially said or refund half the money.
I know it is $8.50 but they stated RRS compatibility - not just Arca Swiss. It is a matter of principle.
I have heard of issues between Kirk and RRS on some clamps and there is no doubt the QR clamps are less open to any tolerance issues. I have a screw clamp on a Benro travel angel I picked up a few years back and if I were to do my Gitzo/Markins/RRS clamp again I would have just gone for the screw clamp - they are very quick and less prone to these types of issues.