I have two Gold Crowns, one is a 3 and the other a 4 (I believe, look at frame pictures below - it has that slate leveling system with the two bolts). The rails on the 3 are much nicer and I wanted to know if these rails will bolt up to the GC4 frame, also I plan on putting on artemis cushions on this table as well. My plan is to have the GC 4 as my main practice table and sell off the GC3. Just want to make sure these two tables are compatible before I try to switch over the rails.