Flyback Part # For Zenith 17X22U Chassis

[JSM092495]

Hello,
I have a 1957 Zenith X2248RU console set that is needing a flyback. I was using the set daily until it went bad about 2 months ago. I'm wanting to see if there's a part number for a replacement flyback. It has the 17X22U chassis. I've tried horizontal output, & the horizontal output tube with no luck, so it leaves me with knowing the flyback is dead. If anyone knows what the part number is on one of them please let me know so I can start looking for one and start pricing the part. I included a picture of the set itself. Thanks in advance.

-Jacques