This isn't a definitive answer, but after trawling through a ton of eBay ads and an assortment of various pics other people have posted in TPMS threads, it seems that to be sure of good fitment it's best to get the shorter/smaller style of sensor, similar to this pic.
Note that it is a clamping type, not a pressure fit, and observe also how there is only a slight angle between the sensor body and the stem, (some have no angle at all).
Some sensors work only in steel rims and some only in alloy, (and some can be used in both). The difference is the angle of the sensor body. In theory a steel-rim sensor can be used on an alloy rim just by flipping it around but it sticks up far enough then that the next time the tire is dismounted there's a good chance it will get broken.
(Posting all this here because I couldn't find a definitive thread on this particular topic. Hope it helps somebody!)
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