91familyxj

Hi guys Im new to this and was wondering if anyone could help me out? I have a 91 4dr with a 4.0 and i bought it and started getting into it and relized the number 6 pistion slammed into the valve but o well i went and got a 88 2dr for the motor but along with that came 2 rubicon springs and the guy I got it from had no idea about them. They are 19" long and like 5 and 3/8 wide. and the numbers on them are RM60120/0055124 I tried looking it up but no luck. So does anyone have any idea or are some coils interchangeable does any one know. Thanks guys