Not seen any nylon washers on the ECU mounting before. They do look like the instrument washers that fall out easily.......
OK, thanks Planenut. Are there two per instrument? I can see where they would act as spacers for the mounting plate that has two hole since it does not appear that they have a large O ring like shown in the parts book. The reason I am puzzled is that there would be 4 washers, two for each instrument and I could only find two.
UPDATE: Two on each appear to work perfectly. Getting the little buggars in there is definitely skill testing , and lord knows where they go when you hear the ominous sound of it falling but not showing itself. I suspect the first speed bump I encounter is going to leave a pile of washers somewhere.