Torque converter I.D.

ok guys I bought a torque converter from the local part store, nuthin' special just a plain old stock stahl for my 904. But I think they sent a 727 T.C.
I am wodering if the splines are any way to tell whether its 727 or 904.
I counted the splines, the smaller set which is the deepest ones there are, and there were 24. The larger set of splines has 27. Is this correct for a 904?
man I really hope so! I have not taken the other one out yet so I cant compare yet.
:sad: