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Looks like your control must have been replaced with a 69-70 style. 68 was different in appearance but probably functioned the same. Dash panel is ribbed in 68.
I got mine from Mancini, but don't see them listing it anymore. Here's a very similar one.
NEW 1968 Mopar B-Body Big Block 22" Upper Radiator Hose | eBay
If you can find original engine bay photos of other cars like yours when they were new online, or a diagram in a fsm, that may be a good reference for getting it as close as possible. Personally I'd prefer them to be long and trim to fit your application.
Depending on what kind of distributor you have, if you can limit the mechanical advance so you can have more initial timing, it may be beneficial with cooling. I have a restrictor plate in mine and set it at 18°/18° with no cooling issues.