I just bought a pacesetter header for my 1988 mazda rx7 and we got it installed and everything but when we went to put the O2 sensor back on it it would not fit. The header did not come with any other sensor nor did they say I would need a new one, and every time I go to look for a new one all I am coming up with is stock ones that do not look like they will fit. SO what I am asking is if I am suppose to cap off this hole for the o2 sensor or do I need to find a new one that will fit. All help is appreciated greatly this car has just been trouble from the start and no one seems to know anything a bout it! Thanks!