02 sensor

so i was looking up o2 sensors for my 92 si, and it seems that bosch makes an oe one and an universal one... i really dont know much bout o2 sensors, are there any differences between the two, and does anyone know a site that they are cheap?

i got the bosch universal just a month ago for my 92 TypeS, and the only thing i noticed is that it doesnt come with the plastic end that you plug into the harness...you'll have to wire it up yourself. as far as performance i'm sure they're not much different.