Hi David, I'm glad to help you out. Air-helper springs are overall the best option for those who want to have total control over the truck's ride, handling, and the amount of rear suspension lift. Let me provide you the manufacturer's installation instructions. You can find more information here: https://www.superspringsinternational.com/instructions/TSS-106-40.pdf I hope this helps. To order the part, click on the link below and take advantage of our post-price-match and limited stocks. Happy shopping. https://www.carparts.com/helper-spring/supersprings/s99tss-106-40?can=CPGG4850

Hi Steve, thank you for reaching out. Per checking, we don't have a direct-fit helper spring for your motorhome. We suggest reaching out to your local auto parts store instead. Thank you for inquiring. Have a nice day.

Hi Nadira, I'm glad to assist you. No, they won't. We don't have direct-fit helper springs compatible with a 1984 Diplomat. We suggest checking the local part stores around your area on what they have available to offer you. I hope this helps, and we thank you for inquiring.

Hi Jay, I'm glad to assist you. No. It is incompatible. The correct and matching part number is ARNA3753. Grab our price-cut offer and click the link below to buy a set for the rear today. Happy shopping! https://www.carparts.com/details/Hummer/H2/Arnott/Air_Spring/2003/Base/8_Cyl_6-dot-0L/ARNA3753.html?can=CPJE1043_CSQA_20230311

Hi Roy, I'm happy to assist you. No. This item is incompatible with the front of a Ford F-350. This item is for trailers. For more maintenance parts, we have a sale on brake parts. To get one for your vehicle, click this link: https://www.carparts.com/search?q=brake I hope this helps. Enjoy shopping at Carparts.com!