paprause--the good thing about stands, is they're all the same size (for the post/hole). GJ, SMA, AC, etc all fit. Now of course, none all fit perfectly or exactly the same, so try mixing and matching. Things I've noticed:
AC stands tend to have the smallest post. Thus any plane which is very "tight" on a GJ stand (like GJ 727's) will likely fit nicely on an AC.
GJ 747's on a GJ stand are the best for a "tight" fit.
GJ 757's are often so loose they won't fit on anything, except an especially "large" GJ stand--some of them. (Like UAL). (Stands vary like .001 inch, but it makes a difference)
GJ L-1011's are all over the place--from falling right off the stands to very tight.
You can get an AC 707 on a DW stand with just a few seconds of triming the post.
DW MD-11's always bank. I think the hole in the plane is off-kilter.
GJ DC-10's fit on most any stand.
When I get more AC stands, I might post about some more combos--never tried SMA on AC stands yet, nor some of the newer AC molds.