The F-40 wing had an “automatic” leading-edge slat on the extended-chord and extended-span wing. I can’t recall whether the old Hasegawa Sabre had the slats molded separately or not. I believe the F-30 wing was the “hard” leading edge (no slat) with the little fence. It has the extended-chord wing (“6-30 wing”) but not the extended span. So you can use the Hasegawa wing with the slat retracted, span decreased, and then panel lines around the slat filled and sanded, and the little fence added.
Here’s a great drawing I found on-line. Jennings Heilig explains it pretty well:
Paul, I did a study of the F-86L and F-20 at McClellan and noticed that although the geometry of the two are the same as depicted on Jenning’s nice drawings, there a quite a few detail differences. The L wing which is the lengthed D wing has heavier skins and as I recall a number of different access panels.
The Korean War slatted-wing early F Sabre would be the narrow-chord wing, and if you’re really fussy, you’d want to remove that “6-3” chord extension from the F-40 wing –assuming that Hasegawa had the proper chord of the F-40 in the kit. Most people won’t even notice the difference, really.