1968 1200c replace split rims with new solid rims

Those are not "Split Rims".
Those are "Lock Ring Wheels"
The Lock Ring Wheel can be serviced at tire & wheel shops that service large truck wheels/tires.

One-Piece wheels can be purchased or built for your truck. Costs $$$.

Disclaimer: This is the web-site of IHPA, so I can't provide any source that is not IHPA.
 
Did you try to check a couple of automotive shops online? I am sure that it won't be hard to find a set of wheels for your vehicle.
 
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