After plowing through lots of catalogues at Lordco (thanks Heidi!) I finally found one that was economical. It's a 3-wire heated universal 02 sensor that should do nicely. I went with a 3-wire heated as my Maverick has a cross-over pipe, and that's where the sensor will be mounted. The risk with mounting there is that the temperature of a single-wire non-heated sensor might not get high enough to operate reliably.