I took some measurements last weekend on the front.
how my front sits atm which would be lowered I have 7 5/8" and with the tire off and hanging a distance of 8 1/2" with tire on is 3 1/2" clearance on top of the tire to fender, as sits now I can't fit my fingers between tire and fender.

I am having a brain fart on thinking of the name of the part inside the coil spring bucket that sits inside of the spring (will call it a horn atm lol) but anyway the horn is 1" on top and bottom, so coil springs would add 2" if I attatchbthe mounting plates and sit on the horn then I would probably ne between 7 3/4" to 8" depending on where I want to make it sit.
4 1/2" outside spring diameter so a 5" air spring would work good, this bag with extended of 7.5" would leave plenty of room for mounting plates and have a stiff spring rate.
there is a 6" diameter at same place.

#2400
Double Convolute
Air Spring
Diameter 5.00"
Closed 2.8"
Extended 7.50"
2000lbs /axle
400psi rated
$76