Sorry for being away. I have been pretty busy. As far as the top plate, you might get lucky and find a used set for sale on this forum or on some other toyota forums. Worst case, you could go to the dealer. <img src="/forums/images/graemlins/scared.gif" alt="" />
I do have one thing to say though. Unless you are dead set on running that type of spacer, get rid of them! They are junk! An out of the pack or "top load spacer" larger than ~0.50 inches is bad news for your suspension. It over-extends the balljoints and also your spindles will be hitting your coils. Everytime you go over even the slightest bump, clang! Even my Daystar lift that is a spacer in the pack and a spacer out of the pack does that. <img src="/forums/images/graemlins/barf.gif" alt="" />
If I were you, I would get a spacer that goes in the pack. You don't run the risk of over-extendeing the balljoints and possibly having suspension issues. Probably one of your concerns is that the spacer that you chose won't affect the ride quality. Well, it is a truck and the spacers that go in the pack are not that bad at all. Like I said, I have the Daystar kit and the ride is fine. A little firmer but I like it.
I would suggest
Toytec Lifts. They make an awesome product and stand behind it 110%. They even offer Old Man Emu coil lifts too. Either one will be a little more difficult to install because you will have to take you coilovers apart. You will be happier with the end result with one of those packages.
Sorry for book. Hope this helps.