I'm taking an alternator off of one Evo and putting it on another. The HD Service Manual shows a spacer in front of the rotor and another behind the rotor, these 2 I have. But, it also shows a "variable thickness spacer" next to the front spacer. Either I lost this one or it never had one to start with. Is it possible that it never did have this? The Manual also states that if the difference between the front and rear sprockets is more than .030" you need to add or pull out a variable thickness spacer to get this measurement. Thirty thou isn't much, can it be off a little more than this?