Washers for 0.190" Ercos

[JOEvig59]

I know there are quite a few posts on here regarding the mounting hardware for Ercos but after reading through them all, none of them really answered my question.  My question is can you use the aluminum washers intended for the 0.125" thick Ercos (flat surface) on the 0.190 Ercos (countersunk)?  I know I don't need them but I think they're a good idea and like the way they look.  My worry is that the hole for the stud may "oval out" over time do to the void space and low contact area between the wheel and stud.  Is anybody else running these washers on a set of 0.190" thick Ercos and have you had any problems with this?  Or is there a washer similar that also compensates for the countersink?  Thanks for any help.