I got my engine back from engine lab and was assembling the oil pump but noticed that no where in my gasket sets or parts from engine lab did I have the washer that goes on the bolt for the oil regulator assembly. For those who don't know it's a bolt that has a spring that sits inside of it the atop the spring is a little fitting with a hole in it. Without the washer on the bolt I know it will change the springs load and all that fun stuff. Is it safe to run without that washer or should I go order one from Nissan since it has to be the right thickness?