I got one from digicape, thanks.
Shiny new SSD installed into my MBP.
Getting windows 10 onto it was a mission tho.
Originally I had Windows 7 on it, which I upgraded to Windows 8, then 8.1, then 10.
El Capitan does not have support for windows 7 any more something about GPT partition, so try I struggled my ass off trying to get it installed. Then eventually it installed but then for some obscure reason it would not accept the original product key.
So I installed windows 8 using its product key (works perfectly! yay!) only to find that once its all installed it wont run windows update because it was installed with an "upgrade key" and not a new install key (dammit.).
So a registry hack and workaround later I'm ready to upgrade it to Windows 10. Can I? NO. I have to upgrade it to 8.1 before I can put 10 on.
It can upgrade from a full version older but not a service back behind? Whatever. So I upgraded to 8.1 and then I upgraded it to 10.
The way to install Win7 on El Capitan, if anyone needs to know, is to format your new disk as NTFS and add a MBR to it using the disk utility, and then creating the media in bootcamp, but NOT initialising the install from bootcamp. Then reboot as normal, hold option and boot from the media. Install onto the new disk. Run the bootcamp tools after installation. If you run the installation from Bootcamp, it formats the drive to a GBT partition and windows 7 will refuse to install.
Oh and I had to swap the drives, so my El Capitan drive is now in the caddy and the Windows ssd is in the main slot.