The four-spoke wheel was optional in both '71 and '72 Chevelles under RPO NK4 "Sport Steering Wheel". There were 8962 ordered in '71; 20,486 in '72. Regardless of the model, the horn cap wore a black bowtie in the center. You may see some '71-2 SS Chevelles with the "SS"emblem in the center, but that horn cap emblem is for early-mid 70's Novas.
The same basic wheel was used (at various times) on several different Chevrolet models, including the Vega, Monza, Nova, Camaro, Monte Carlo, and Chevelles/Malibus. Since they were fairly prolific, you're correct to say that you can find nice ones out there. Try to find one that's had a rim wrap on it, and the grain on the wheel should still be nice and crisp. I've bought nice wheels as cheap as $20 at swap meets, and up to $75 for really nice (wrapped) ones.
"We, the people, are the rightful masters of both congress and the courts - not to overthrow the constitution, but to overthrow men who pervert the constitution." Abraham Lincoln