Severne ncx gator
 

I will replace my gaastra quiver with severne as soon as possible.
I find it difficult with the mast recommodation..
I want the same mast for the ncx 6,5 and the gator 5,5.
Which mast should i buy; the blue line 430 (wich is COMPATIBLE for both sails) or the red line sdm(gator is RECOMMENDED with a 430 rdm)
Which single mast will work best with these to sails?

regards MOP