so the blower motor in my furnace went out. ive looked it over, and changing it myself looks like a fairly straight forward process. anyhow, ive found several blower motors, searching the part number listed for it. ranging in price from $75-350. the part number is HB43TR113. my question is, how do i know which one will work? if the search shows all of these, id imagine some are just cross referenced between different manufacturers. they are listed as a 1 phase 1/2 hp 3 spd 115v 1075 rpms. i just dont want to get the wrong one. thanks in advance.