Might have answered my own question by following the RockAuto link above. According to their listing and then I found the manufacturer's catalog the 3 wire is readily available at a reasonable price i.e. $50 ish. Oddly, for the last 2 weeks all I was finding was $150+ for the correct one.
here is the manufacturer's catalog: http://www.shee-mar.com/PDF/2011%20catalog.pdf
Dave
here is the manufacturer's catalog: http://www.shee-mar.com/PDF/2011%20catalog.pdf
Dave