I bought a new AC compressor and didn't check how many grooves it was.My truck uses the one with 6 grooves. The one I bought( 8 grooves) was 142$ and the one with 6 grooves is 288$. Instead of sending the one I have back, I was thinking for 146$ I could change the pulley over from the old compressor. I watched videos of how to take compressors apart. granted none were for the compressor I have, but I think it'll work. I was just hoping for some reassurance. both AC compressors are similar( my dad has my truck right now so I cant say identical). the only difference is the pulley, I think. when my dad gets back ill check for sure.