R5 Fork Spacer length?

[Djg8493]

I am currently replacing fork seals and adding the Pre-load adjustable caps from Economy.  When I opened them up I found that the previous owner set his preload by adding longer spacers (#18 in the image)  The problem is they are currently too long to be used with the Pre-load adjustable caps as there is no chance that I can compress the spring enough to screw the cap back on.

Does anyone know off hand what the stock spacer length is, and if there would be a better length that i should keep them at to add a little extra stiffness with the adjustable caps?

Thanks