I have been using the Lee Factory Crimp Die on Station 5 of my Dillon 650 for about 18 months now with absolutely great results.
The part I get from
http://www.kempfgunshop.com/ in Michigan City Indiana, cost about $21 including shipping.
On some of the tool heads, I have to put the set lock nut on the bottom of the plate as the die screws in just a little far to catch the threads to lock it from the top. The nut does not interfere with the shell plate.
I've got a bunch of rimless range brass in various calibers that were running about 40% discard due to the 'glock bulge'. Setting the Dillon sizing die down as far as possible STILL did not solve the problem... Since the Lee FCD, discard rate has fallen to ZERO!!! Some of them have been back now for the 3rd reload since my original change to LFCD on used range brass, of unknown prior history....no problem so far.