Hi Tamara,
I think it's great that you're trying to help your Grandpa reunite with his old army buddy.
Have you tried a Canada411 search for this gentlemans name, just to see what comes up?
You could also perhaps try contacting someone from the Legion? I think their website
address is www.legion.ca. Explain that your Grandpa requested this as he wants to reconnect.
Maybe they can at least advise you.
I helped a gentleman reconnect with his best buddy (RCAF) a couple of years ago. They
hadn't seen or spoken to each other since 1945, so it meant the world to the man I was
able to help. He's 88 now I believe and finally fulfilled his wish.

His "bud" was his navigator ...
and his bud passed away not long afterwards, so the timing just worked. I hope your Gramps
is as fortunate to connect and that its not too late.
Cheers