Richard, Just replaced several lift supports on my doors on my 2000 Marquis. Engine compartment door is 60 lbs, bay under the drivers seat drivers side is 60 lbs, generator door is 80 lbs, storage door left side next to generator is 60 lbs, wet bay door is 80 lbs. All doors that I have mentioned and drivers side. All lift struts and 20 inches center to center while extended. Bought them on Amazon and grand is Suspa. Just look for the number 20, means center to center of mounting pockets, and then the resistance in lbs that you are looking for. Amazon seams to be the cheapest for me