You would make an image of your current SSD RAID Volume, Then remove the 2 25GB SSD and install your 2 new SSD's Then Restore the image you Created to the new SSD's
I recommend
Macirum Reflect to accomplish this.
If it only restores to 1 of your new SSDs then simple recreate your Raid 0 using the windows IRST program.
If you don't have windows IRST installed it's in your eSupport folder.
You can also create the RAID 0 with windows storage spaces. I don't recommend this but its available.
also be sure to leave your new SSD's just as they came from the factory RAW not activated and not formatted.
G752VY-DH72 Win 10 Pro
512 GB M.2 Samsung 960 Pro
1 TB Samsung 850 pro 2.5 format
980m GTX 4 GB
32GB DDR 4 Standard RAM
Z97 PRO WiFi I7 4790K
Windows 10 Pro
Z97 -A
Windows 10 Pro