Duster leaf springs stock height measurement?

HI guys im wading through all of the options for leaf springs and would like to do business with my local spring shop. Does anyone know of a measurement for stock ride height? I talked to a gut from Eaton and he said it was just under 11" from the lowest part of the rear bumper but that is way too low. I dont know where he got that info. I did see a previous post stating the factory service manual had a measurement but I have not been able to find that. My car has some additional weight from new rear frame rails torque boxes and sub frame connectors along with a bunch of dynamat and undercoating so its a couple hundred pounds heaver than a stock 360.
Thanks for any help!