[AMPowerJ]

The Dinan spring, bumpstop, and guide supports are all engineered to work together. Just because these are existing parts doesn't mean that this solution isn't a good design. In fact I think it makes it even better since they are OEM proven parts. With that being said, without the Dinan spring with their specific rating then modifying the bumpstops and/or guide supports with H&R or other springs isn't going to do much for you IMO. Should give you more travel before you hit the bumpstop but it still isn't going to work the way the Dinan kit does because the H&R, etc. springs are shorter to begin with.