I've recently purchased a 6112 / 5160 setup for my 2019 Off Road. I have the 6112 product number 47-281202. Apparently it is the medium duty version of the 6112s and it is set at 1.5" which is the lowest setting. However since I don't have any added weight I think it gave me more of an 2.5" lift since I now have a negative rake (the front is 3/4" higher than the rear). The rear has the 5160 with factory coils. So now I'm looking to purchase some B12 coils and was wondering which would be best suited for the 6112 kit, 47-281202. What's the difference between the three different sets (besides stated ride height)? I've gone back and forth with Bilstein and they don't seem to know much at all about their products. The three coils in question are: 36-281817, 36-281824 and 36-281831. I'm leaning towards the heavy duty ones (36-281831) since they would more closely match the coils on the 6112s up front. Any help would be greatly appreciated!