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I am looking for a power brake boosted brake pedal for a 1965-1968 fury application.
Manual or automatic transmission?
That information will help you for sure.
Lots and lots of those pedal sets. As you seem to know from your thread title, you can select a power brake pedal assembly from any 65-68 C body and it will fit. Mind you, if you're converting a manual brake car to power brakes, you'll need the pedal mounting assembly too, as it's different. Make sure whomever you buy this from that you get that part too.
I would contact Nigel Mills at www.nationalmoparts.com - he's a member here, and his business is parting out Mopars, and he's a really good guy.
I can confirm that Nigel has quite a few power brake slabs up at his shop.