I can never figure out which one of those to use. FWIW, I use the mark on the timing belt pulley (crankshaft) and the oil pump housing. I think its at about 5 o'clock if you look at it strait on. The pulley itself has a little mark on the ******. Sometimes they are hard to see but they are both there. I align those marks and put the lower T belt cover on and then the balancer pulley to see which mark it is on the balancer.Then I mark it. I hope this helps.