Both of my seat rails are Spoon, the drivers side is V1 which as markleavey said only locks on one side, which is not that great tbh. This one was in my car when I got it, I am 6 feet tall and it feels awesome. Then I picked up another Spoon seat rail on flEbay for my other seat about a year ago, directly from spoon sports europe for £70 which I think was a bit of a bargain, you may have to pay more for a used one or you can wait it out like I did. This time it was the newer current version, which is completely different from the version 1. It does lock on both sides and it sits ever so slightly higher. Both V1 and V2 Spoon rails are lighter than the OEM rails, V1 is the lighter one tho (as it is much simpler in design). If I could choose I would go for the V2, it only sits marginally higher (you would not notice the difference unless pointed out in my car tbh) and it feels a lot more solid. Hope you find your rails soon!