Please keep in mind when I posted this thread 7 years ago, it was already 3 or 4 years old (I did a copy/paste from my post at www.toyotavanpeople.com when we started this site). It's not that I don't want to help, it's simply been over 10 years and I don't remember details (I actually had to go back and read to see what info I put there). In going back I see that along with comparative info, I also gave brand, part number, and application (it's right there in post #1). I may not have posted all available information about the springs, but all it took was about 2 minutes to google/come up with the following links:

http://www.rockauto.com/en/moreinfo....333369&jsn=438

http://www.rockauto.com/en/moreinfo....333369&jsn=440

http://www.rockauto.com/en/moreinfo....333369&jsn=439

It was a fun mod and IMO was much needed for people who may want to take their Previas off road. Although the sprngs are only 1 1/4" longer than the stock coils, they are bigger gauge and do not compress as far (thus giving a full 2" lift). No other mods are required on the rear except I'd recommend adjusting your proportion valve and perhaps adding the bump stops (all covered on page 1). If I were to do this again, I'd probably use Sienna struts or go with the way mountainhick did his. The way I did it in this thread will not allow larger tires (at least in the front), theirs will. If you search the forum I'm sure you can find the other threads on this. Good luck. Tim