Hi again Unreg,
I just got a reply from Remi Vila and the same 36cm adjustable mast extension is supplied with both the 7.5 m2 and 8.5 m2 Phantom 295 rig packages.
The only difference would then be the sail size vs mast length.
For the 7.5 m2 you will be getting the Severne Blue Line 460 cm 75% carbon content IMCS 25 mast.
For the 8.5 m2 you would have been supplied with the Severne Blue Line 490 cm IMCS 28 mast.
Hope this helps,