You can measure the square body, should be 2" or 3" wide and this would be the valve you purchase for replacement. The extra long rods you can make using hardware like a metal coupler that has treads thru the body and use a thread all rod the same size as the coupler and cut to the length you need. Screw the handle on the end of the cut rod.
The valves you can purchase at any RV store, eBay, or amazon. See photos below.
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