Need some help on upgrading coilovers!

[Overw8gorilla]

I have a 2019 Ram Sport 1500 with a 4" BDS suspension lift. When I got the kit, it came with 4" pucks to put on top of the stock coilovers. I have had that set up for about a year now. I want to upgrade from stock coilovers to ones that are long enough they don't need that puck. Where I'm stuck is how to properly measure the stock coilover to get the geometry correct for purchasing a longer coilover. Cany anyone help guide me thru how to measure properly. Or if someone has done what I'm trying to do, what aftermarket coilovers did you go with and the overall length of the coilover? Thanks!