R/M does not make the F4U-5N. They package Hasagawa's kit under license.
See Tamyia and Hasagawa for early Corsairs in 1/48th scale. Hasagawa has a few variations of the F4U currently available. I think Tamyia has a birdcage Corsair and an F4U-1D. Check on the Squadron website or the Great Models web site. Then you will know for sure what is available.
There are a couple of other early Corsairs, but the Hasagawa and Tamyia kits are much better. Otaki's F4U-1D is a decent kit if you can find it. I remember seeing decals for Pappy's Corsair but cannot remember who made them. I think Hobbycraft made a "birdcage" Corsair, but I'm not sure of that.
Hopefully someone will post a source of decals, because I would also like to do a Boyington Corasair. If I remember right he had the name Lulubelle painted on the side of the airplane. The number 88 comes to mind also.
Monogram did have a 1/48th F4u with folding wings and retractable gear, but it was more of a toy than a scale replica. rangerj