I just changed out most of the old struts on the basement doors of our motorhome. The old ones still work, but they're only pushing about 1/2 their rating. I was just going to trash 'em or take them to Goodwill, but thought I'd ask first...
struts.jpg
-they're all 17" out/ 10" in, and have 10mm ball-socket ends.
I have 10ea 40# and 7ea 60#, and by Tuesday I'll have a half dozen 90#ers.

no charge, I'll even ship 'em