Convert 6 lug to 5 lug - which brake drum?

[7791manz]

I have a 69 C10 with a 6 lug 12 bolt and am converting to 5 lug discs in front so want to convert to 5 lug in the rear.

1. Can I have my original axles redrilled or would new Moser Engineering axles be the ticket?

2. What year trucks should I get the brake drums off to fit on the 69 drum brakes once I convert to the 5 lug?

Also, Here is a couple of pics of my new project if I did it right.

Thanks for the help!