H Series H15 Rear Suspension Problems

Greetings,
I have an issue with the H Series H15 where the rear suspension only gives me access to off-road shocks and springs, the rest of the rear suspension works fine. The H45 cab has no issues with the rear suspension and works like it should. I removed all H-Series mods except for adjustable turbo for the 6.0 Diesel and I am still experiencing this issue. Does anybody know if it is a mod that I still have installed or if I can somehow delete and reinstall the files for the H-Series to regain those rear suspension parts. Any help or advice is greatly appreciated, if there is any documentation I can show please let me know, thanks for your time!