Rim and Sprocket Parts - HELP ME PLEASE!

#1
Ok, so...I am a total newb when it comes to mini bikes. (love the site, by the way). I am in the process of rebuilding a 69 Rupp (I believe) and have hit a bump in the road -- my rim is cracked. For some reason, I just can't seem to find/figure out what I need as far as parts. I will be using a band brake instead of the drum seen in the pic, so I'm not concerned with that...only the rim, hub, bearings, and sprocket assembly.

I would appreciate any help with this. Maybe see some example photos if anyone has any. Also, link to products would be much appreciated. If someone could show me where to find a similar rim with hub, I could match it with my front wheel (that would save me from replacing both wheels).

I've included some photos of the current rim and sprocket. It's a 6" rim (which from photos, appears to possibly be original from the 60s-70s??).
 
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