I purchased a new nipple and o-ring part # 335234 for my 1991 Fastrike the nipple is now white and the groove for the o-ring is at the top of the nipple unlike the older one which had no groove but we cannot get it to go in we put oil on the o-ring and try to push it up into where it goes but it won't go do you think it's possible that I got a wrong nipple even if the # are correct.I ended up putting just the new o-ring on the old nipple for now???