I had a set of old Recaro LX-Cs in my Miata (you can find pictures of them installed in my build thread). Still have them, but only use them now for when I want to be held in place (like when I went to MATG this year). As modernbeat mentioned, they hit the seatbelt tower before you can use all the travel. You are also limited on forward motion due to their width. I really want to find a set of LX-As (IIRC that is the designation) which don't have the thigh bolsters as that is the only thing that bothers me on long trips. For reference I am 6'01" with a 34" inseam and 34" sleeve.

There are a couple of places in Thailand that sell Recaros on eBay (where I got mine from). Most of them are older models like mine, although they do occasionally have some more modern seats. Prices have gone up some since I bought mine, but if you get lucky and bidding is low you can get a set of $1000 shipped. I type in "recaro seats" for my search, and then change the category to all.