Hello Plumberguy and welcome to Stovebolt.com!
Be sure to post a thread about yourself and your truck in the Welcome Centre forum.
The Big Bolts forum is a good place for general questions, but be sure to post your "Parts Wanted" ads in the "Swap Meet" section.
On the brake pedal stop, are you talking about the rubber piece that goes on the engine side of the firewall? If so, most of the parts vendors will have it -- check the Links section for Parts. It's the same part as for the pickups.
On the mirrors, if you aren't wanting strict originality, I've seen a few trucks of your vintage with the after market "West Coast" style mirrors you can get from NAPA (Canadian Tire?) that look pretty good. If you want to stay original, there are long arms that are correct for your truck -- just go with the larger diametre mirrors you can get from the parts vendors.
Some of the other guys might have better suggestions so I'll leave the floor open for them. You might want to repost your question in a new thread -- this one was originally to announce the calendars were ready so probably not too many people are checking it any more.
Thanks for stopping by and we all look forward to having you here -- keep the questions coming!
Regards,
John