I thought I could help, but I think the info that I have will only confuse you more. Digging into my boat info files, I found the following:
Gas strut for refrigerator is Lift-O-Mat FVR20 0100N 102/95
Gas Struts: Spring Lift Corp, 113 Commerce Drive, Monticello, AR 71665, (501)367-2404; refrigerator Pt # SL3-30#, Freezer Pt # SL3-20#
I think I replaced the refrigerator lift arm, but maybe I replaced both refrigerator and freezer.
The SBO website indicates that the lift arm is the same for the refrigerator and freezer, but the lid sizes are quite different, so I am puzzled.
I think that the above information was printed on either the original lift arm or the replacement, but I don't know which.
I checked for a picture but I do not have one that shows any markings.
I do know that what SBO sent me fit and worked perfectly.
Sorry I can't be of more help. I would call the SBO store and ask them for their best recommendation.