So I was ordering a solid (with removable nose tip) 18" bar for my 555 and my service dealer happened to pull one off the shelf that was a 16" by accident. Honest mistake, no big deal...but when it was out of the box and he he realized this, he mentioned it would be just like it, but 18". This is where the question comes in. I noticed the oiling port on the bar itself is a small little hole at an angle. The 555 came with a laminated 20" bar and the oiling port is a round hole. If you lay the bars on top of each other my original 20" bar and the 16" bar's oiling ports lay right on top of each other.....just a different hole geometry. Is this ok? Just want to make sure the bar gets the appropriate oil.