Replacement harmonic balancer for a 66

[FickleLife]

I am looking for a replacement for my harmonic balancer as I want to go from 4 bolt to 3 bolt for more crank pulley options. I've pulled it off the car (66 302, but I think the engine was from a later year mustang) but I can't seem to find much information when searching for the numbers on it. Here are some pics: https://imgur.com/a/awIXg6D and it looks like the markings on it are

72DA
8316CA

And on the balancing weights (not sure what ? is, it's worn off)
09
?5

Does anyone know where I can find more information on this harmonic balancer to find a compatible 3 bolt one? Thanks!!

[Reborn67]

I don't know how to post links, but if you look up YouTube " My vintage iron"
Go to the videos list and search
302 pulley problems,
Might steer you in the right direction and it's an informative site too,

[FickleLife]

Thanks Reborn, that shed a lot of light on the issue.

In the end I went with (original 66 setup, theory is I have a 70s motor in a 66 stang):
- 1964-68 Mustang Crankshaft Damper 260-289 https://www.custommustangs.com.au/1964-68-mustang-crankshaft-damper-260-289

- 1965-67 Mustang 289 w/AC/PS Crankshaft Pulley Triple Groove - Black (6 21/32" OD)
https://www.custommustangs.com.au/1965-67-mustang-289-w-ac-ps-crankshaft-pulley-trip

Will be installing today and I think this will solve it once and for all!

[AussiePhil]

Hey Fickle,
This might help you identify your engine year of manufacture.

There is a cast number and a stamped number at the back of the valley.

https://www.mustangreloaded.com/mustang-engine-codes/

Cheers Phil.

[Reborn67]

Just make sure you have the correct balance weight for the era of the engine, not the car,
Reborn..,