Are the washers that come with new spinning reels pretty universal? My Stradic is bunching at the top of the spool and I have some washers that, I believe, came with a Lew's.

I just replied above, if they go on the main shaft they'll work.

Spacer washers are interchangeable only if the inner diameter fits the main shaft correctly and the shim sits flat, so brand name by itself is not the deciding factor. For line bunching at the top, add one thin shim at a time, make 10 to 15 casts, and check line lay before changing anything else, because too much shim will usually push the stack to the bottom. Also check spool fill level first, since overfilling can look like a shim problem when it is really line management.