I pulled my shifter out of the transmission trying to race a Subaru, bad idea! If I remember right, the "round metal piece with metal squares sticking out around it" unscrews out of the trans and comes out with the entire shifter. The trans linkage is then exposed. Be gentle with that round metal piece, in my 1975 4 speed, the threads were plastic, and should not have been cleaned with a wire brush! Oops
I love the grilles on those early Bobcats