Per onehundred80: "Is that number actually a 33500 part renumbered for that tire store?" Beats me Dave, but looking closely at that sensor you do see the I D #33510 appears to be on a piece of black tape suggesting Discount Tire's attempt was to make it that way and, of course, upcharge the customer. Yup, google search turned up zilch with that #. So, it's a safe bet to focus on the 33500 which supports both mghz (315 and 433).