Video over twisted pair (Cat5)

Hello, I am in the security industry and am tried of paying big $$$ for video baluns. 75 ohm cctv on coax to 100 ohm video on cat5. I have opened one up and it appears to be an impedance matching transformer however.... there are no part numbers on it. Could anyone be so kind as to help me out with a spec for the balun so I can pick one up at the local electronics shop... Forever in your debt...

You won't find a video balun at the local electronics shop. People don't buy them.
Order the minimum order of about 10,000 of them from their manufacturer.

I would if I knew the specifications... but thanks anyway for your comments..

They are impedance matching transformers. Snoop around on the ARRL website and see if you can't find directions for winding your own baluns.

Checklist:
Enameled magnet wire - check
High performance ferrites - oh..er..minimum order of 10,000 from manufacturer - drat! foils...cursed again

Check out Amidon.