I hate those damned things to. Unfortunately, the European makers aren't the only ones getting in on the act. My tried and true all American 1995 Jeep Wrangler was loaded with them, as is my wifes '02 Jeep Grand Cherokee. I've actually broken a few of the tips off my torx bit sockets on the Wrangler, without stripping or screwing up the bolt, go figure. Thank god for Craftsmans no questions exchange policy on broken hand tools, thats saved me hundreds of dollars over the years.

Easy way to test if a bolt is the same thread type, find a nut that fits the torx bolt properly, then find a hex head bolt that fits that nut. Easy to do in most hardware stores that have those walls of bins and drawers full of nuts and bolts. Not so easy in a place like Home Depot where everything is in sealed plastic bags. Either that or just buy a metric thread gauge.