I got the boat roller at West Marine. They only had 12" rollers in the store, so I bought 2, since I didn't want to stress about not cutting off a finger while slicing a 2" piece on my chop saw....actually, this turned out to be a good decision, since it took a bit of practice to get a nice clean cut (I mangled the first two).
I got the bolts at Tacoma Screw...I used 8 120mm bolts and 4 150mm bolts. All were 10 X 1.5 thread (10.9).
I selected these sizes as they were ~1" longer than the OEM bolts (they only had bolts in 10mm increments). But, the pucks compressed by ~1/8" (something I did not count on) and I could have gone 10mm shorter on all of the bolts.
If I were doing this again, and knew in advance the correct bolt size, I would have ordered exactly what I wanted from McMaster Carr or similar, but that's why I'm posting this thread, so you can see what the OME bolt lengths are, and plan ahead if you do this mod.
All in all, this is an easy mod. It did take me nearly a day from start to finish. Tracking down the right parts took some time (driving around town). Removing both batteries and trays...and both were rusted so I cleaned them up and repainted them. Removing the access plate for the rear-most bolt was a serius pain as the screws were rusted in place (thankyou impact driver). Most of the body lift bolts came out fine, but I'd hit them with aerokroil a few days earlier.
By far, the most fun part was reefing on the high-lift and watching the body lift right off the frame.
Here are a few more pics...