I have two quilting guides - the lower one clips into the foot like the hemmers. Interestingly- they Singer attachment manual show the upper type - and if you get the screw, it tightens down on the bar, so it won't move around on you.
This is the same style guide that came in Puzzle boxes, so there may be variations on it. The one in my picture is from a puzzle box, so maybe the one sent with the set (being newer) is a bit lighter weight.
The set that goes with the 66 has a different tucker and ruffler, so I figure that different quilt guide is more in line with what goes with the 66 than the 27.