Yep, MAC's is a great and easy way to go! They used to make a pretuned set for the YS-45 but discontinued it when the 45 went away. Now that the 45 is back, call them and see if they started making it again.
The last time i went into Sheldon's Hobbies in San Jose, CA. They had 1 on the shelf. Try calling them also!
Good Luck.