As said the bottom adjustment nut can be turned to stiffen them up but not MUCH adjustment in there, a little bit but not much.
SHEE shocks bolt right up no probs, sometimes depending on your setup a washer or 2 are needed to close the gap on the upper mount, but again just as easy as a few washers. the SHEE front shocks are a GREAT upgrade over stock, especially with your size, no doubt and TESTED!!! I:I
On another note, I have to agree as these specific shocks you list in the FEE-Bay auction are OLD, much newer/better condition can be had easily, hold out and grab something newer/cleaner, my lightly used 2005 white SHEE fronts were $65 to the door, and as new as used shocks can get.
With just a quick check on EBay I found many other sets, from newer Shee's, at good prices, check them out.
Hold out, you will not be disappointed, and YUP Shee's bolt right up on the Blaster front end, go get um!!!