Hi Buddy,
Welcome to the 'Bolt.

Do you have pics of you truck? I have a '37 1-1/2 ton truck - see the link below for pics. My door posts are metal. Are you asking about the fenders, or the doors ... or both?
Someone who knows more about the '36s will chime in, I'm sure. If you don't get much response in this forum, then maybe the moderator will move you up to the Big Bolt forum. Yep, you graduated! lol Everything 1.5 ton and greater is considered a "big bolt".

Looking forward to hearing more about your truck!