You certainly can ask, but the truth is that there is a VERY small market for people who want to lower their Jeeps and make them more street friendly than they are from the factory, so while I can't say for sure I would imagine that you are going to have a real hard time finding a company that makes drop springs for TJs.
Your best bet would likely be searching for and talking to a local spring shop. They are few and far between these days, but there are still some out there. See if they can do anything for you.
Worst case scenario is you'll have to just cut your stock springs down some (probably not a good idea to take 2" worth of ride height out of stockers though) and find smaller shocks to match.
1992 Cherokee Laredo - all stock, DD. Needs some minor rust repair, then on to the mods!
He clearly stated he wanted to lower it for it to be easier to deliver mail, which is his job. I'm guessing stock Jeeps are taller then the average mail box. Ever gone to drive thru atm and had to reach down to enter your pin? If you do it all day it could be uncomfortable.
Maybe try some sagging springs from a junkyard jeep, or maybe weighing it down more or smaller tires.
The only suggestion that I would have for you to lower a Jeep is to have a custom spring shop like Standen's or Calgary Spring and Suspension here in Calgary to custom spin up a set of coils for you.
The front-end could be easily cut down, the rear springs are "tight-rolled" on both the top and bottom making it harder to cut it and keep the spring centered on the coil-button.
Hello, my name is Vance and I am a Jeepaholic. Its better to be naked with your friends, than to be clothed with your enemies
Silver 2006 TJ Unlimited, zombie ready as the daily-driver