Check out this website. You can click on 'search by size' and also look on the home page for 'brackets' and eyelets. I bought some for my minivan rear door, as well as my motorhome and my bed supports too!
The minivan I also needed new eyelets because the drivers side then the passenger side eyelets both broke a year apart.
http://www.liftsupportsdepot.com/I also saw pictures posted by a guy who also installed a pillow top mattress like mine, and he installed a extra aluminum brace across the bed platform, and under the top, then ran 4 new struts from one level to the other.
You can buy them say 20" long and with anything from 12 pounds of pressure (I installed 20# for my small access doors or 35# for the wider and heavier doors) all the way up to 140 pound ones for my minivan! Beyond 100 pounds, then it is more likely that the strut can break the eyelets.
Good luck,
Fred.
