48 merc shocks

[whatdoyouwant]

I have questions about the front shocks on my 48 mercury. Fully extended they are 18-1/2 inches, closed they are 11-1/4 inches. These measurements are longer than the after market shocks that are advertised. Questions about removal. The top connection is simple, just take the nut off and pull the shock from the stud welded on the bracket. The bottom of the shock connect to part of the suspension. I take the nut off and nothing moves. Is the stud part of the shock. I can't see any thing that looks like the head of a bolt on the other side of the shock. Is the lower bolt threaded into the suspension? Any help would be great

al