I purchased a 3rd party tripod collar for my 7-2F4IS and it's build quality and functionality is excellent, basically identical to my L collars. I have no affiliation with the eBay seller "Roxsen", but they have quality collars. The collar was $77 shipped. Here's what I have written at my site on it (sorry if it sounds like a sales pitch; again, I have no connection to them at all):
I do not have ANY affiliation with the eBay seller Roxsen, but I purchased their tripod collar for my 70-200 f4 L IS USM (purchased on 11/9 for $77 and arrived 11/15 to the USA from Hong Kong) and it works flawlessly. The collar is very close in color to the L, maybe a tad brighter but hard to tell in most lighting. The construction is solid metal and the turn-lock has a nice "seal" when tightened fully, just like my Canon L collars. I would highly recommend this collar as it is 66% the price of the Canon version. This is an excellent 3rd party purchase. If interested, their eBay site is http://stores.ebay.com/ROXSEN
I'm big on collars, especially since I use my m/t-pods a lot. Even with this lens, mounting it to my battery grip renders too much "droop" and play; these collars basically eliminate all that so composing/framing is extremely precise and images as sharp as can be. Anyway, here are four images from different angles:
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