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Rich, there will probably not be any parts for this stove anymore, but if the BTU's are stamped on the stove for the individual burners, you should be able to figure it out as far as orifice size knowing the properties of natural gas. Then the orifices can be drilled out to the proper size.
At 3.5 inches water column, the 8500 orifice should be drilled with a #53 drill bit, the 12,500 orifice should be drilled out with a #50 drill bit and the 14,000 orifice with a #48 drill bit.
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