Hi, I ended up using 2, 150# gas struts for my M-416 trailer lid. So I have two extra 50# struts, from McMaster-Carr:
Gas Spring with Ball-Joint End Fitting, 50 lb Force, 35.43" Extended Length, 16.14" Stroke
I paid 20 bucks each, willing to let them go for $20 plus shipping.
There is some...