I've got these springs in my garage that someone dropped off and neglected to tell me what they are for. I've lost contact with him and I've even tried H&R's website but can't seem to find a match on the part number printed on them. They're black in color, and in white lettering:
"3C 863R" then on a few coils up, printed in white perpendicular to a spring (if held vertically) is "93".

Anyone know??

 

ttt, no one knows?