Early A Front Brake Cylinder R & R Challenging Me

I go to replace a wheel cylinder this morning on the '65 Formula S and at first I thought I was seeing things--no access to the rear fastener (photo #1). The front fastener looks available for a tool (photo #2). The rear fastener has it's own little nook like it won't be bothered. "Simple" things like this end up taking all day.

front wheel cylinder 1.JPG

front wheel cylinder 2.JPG