That apears to be the same type of spacer that is used on the Titan's. It goes on top of the strut assembly and bolts back into the truck. Here is a pic of were it goes on the Titan. It's a much better option than one that compresses the spring like the Daystar style. This type doesn't damage the shocks or effect the ride quality either. If you want, stop over to www.clubtitan.org and do a search for "PRG" and you will get tons of info on it. PRG stands for "Pre Runner Greg" He is the guy that makes them for the Titans.
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Check out this post he made on another forum. 
