Eagle Secret Service grips don't extend below the gripframe. Craig Spegel makes a lovely N frame boot grip, but unfortunately I don't have any to show you.
The synthetic grips on the left have been offered on the auction sites for some time and are compact and inexpensive. I don't know who made them.
I just put a pair of ahrends 3 finger tactical combat grip on in cocobola...man it is the perfect short grip for a large Nframe. they went on my PC627. the eagle grips worked fine and actually were ok to shoot full load 357 mag, but my brain kept wanting my pinky up on the grip. For me, I couldn't do it comfortably on the two finger boot grips...worked, but not optimal. These ahrends are the perfect compromise. its still just as short at the rear of the grip where the backstrap dips into the grips, and adds just enough wood at the front to have a third finger groove. perfect width as well. I'll post some pics of all angles tonight. I am one happy dude with the new grips. Especially since waiting for ahrends is about 5 weeks, gripseller didn't have the wood I wanted and spegels are a 5 month wait. I walked in to my LGS and they had two pairs left of these. I picked the favorite grain and was OTD happy.
and here's a pic of what mine look like except mine are a more uniform mocha grained set and not like the contrasty orange/black grains seen here like a lot of cocobola can be: