Haven't really been able to find anything 12+" on the open market, save for the stuff that came with the Superlift that they want $130 for a pair.
Got the new links in this weekend.
Went with 1/2" Grade 2 all-thread, Grade 5 fasteners (they were cheaper, for some reason), 1/2" galvanized pipe and the 9.8103G bushings.
Slightly modified the described install:
From top to bottom:
1/2" Nyloc
1/2" Lock Washer
1/2" USS Washer
ES Bushing
Sway Bar
ES Bushing
1/2" USS Washer
Pipe
1/2" USS Washer
ES Bushing
LCA and Spacer/Shim for the hole in the LCA (came with the Superlift kit, I think? 1/2" ID ring that fits into the hole in the LCA, was already on the Explorer)
ES Bushing
1/2" USS Washer
1/2" Lock Washer
1/2" Nyloc
I had originally intended to use jam nuts on the bottom, but things were being a pain getting them to go on the all thread along with the washers - the lock washers were probably overkill, but I felt more comfortable with them.
I used blue threadlocker on the stuff too, so I don't think anything will come off.
I really wanted to use the bigger bushings, which is why I ended up not going with 3/8" stuff - not to mention, not being able to find 3/8" pipe anywhere.
Would have LOVED to go 7/16" so the bushings would be an easy-on/easy-off were I to ever want to disconnect this quickly - the bushings are great, and held up to me stretching/twisting/flexing/forcing them over the 1/2" thread, but it was a relatively time-consuming process, all things considered.
Ultimately, I'm absolutely thrilled with the results. The Explorer drives like it did when I bought it 10 years ago - it's like a whole new truck! The popping and clunking is gone, it's on rails now. Absolutely fantastic.
I've got to admit, I was seriously considering getting rid of the thing - fixing up the problem items so that I could offload it for an Expedition, and concentrate on my F-250, but now? I'm in love again!
Many thanks to all for this thread, all of the posts, and all of the answers to my questions!