For the rubbers for your windows and your convertible top, our sponsor (NOS Reproductions, at the top of this page) is a great supplier.
You might know this, but your car is basically a '67 Impala frame and running gear/mechanicals with a Canadian Pontiac body on it. All the mechanicals would be '67 Impala, including the brakes. Therefore a brake conversion for your car would be exactly the same as a '67 Impala conversion.
Some '67 Impala interior parts work ... some '67 American Pontiac Interior parts work. A few are Canadian Pontiac specific.
Some American Pontiac exterior body parts fit and some exterior parts are Canadian Pontiac specific.
The guys that own '67 Canadian Pontiacs on here will give you more details.
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Prince Edward Island
'64 Parisienne CS "barn find" - last on the road in '86 ... Owner Protection Plan booklet, original paint, original near-mint aqua interior, original aqua GM floor mats, original 283, factory posi, and original rust.
Agreed about NOS our sponsor. I got the window seals from them and was real happy with the quality. Also, the price was better than if I bought them out of the US.
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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles
1966 Grande Parisienne, 396 1 of 23 factory air cars