I got mine off of ebay for $45. The just push the eyelet on the shock back and down a little more to get the height you want with longer shocks (i.e. Road King air shocks). People are a little leery about using them because they say that having the shock at a different angle isn't safe, but I've had mine for over a year, and they are fine. I love them. I put 13" RK air shocks on my Iron, then put the blocks on. Now, it rides about 1/2" shorter than stock, and I LOVE it. These are the ones I got: