I'm torn about this I just got a deal for Billy's on the back and am debating on the 5100's on the front or just get spacers. Mine is a 15 too and the struts only have 3k on them. I don't really know what to do with the old ones if I get them maybe they will fit on my buddies 07. I had an 06 and always really hated the stock struts, but I would really like the full 1.5" in the front as I want a 1" block in the back to keep some rake. It came with Goodyear sra's on it and I hate them I would love a nice 33" tire.