I can get you guys lowering springs for this truck. I work with a manufacturer in Japan and they are made to order I've done for a few people. They are pricy and work great.
call or text me if you're looking to lower 1", 2" or 3" 717-319-2100
Also, I have another option which will cost less, but you'd need to send me your current springs and a factory I deal with here in the U.S. with make them for me, but we will need your old springs first.