Hi Econo,

23 is a spring washer so I doubt you can make it.
7 is a collar/spacer that slides over the axle; not a washer. Without it, your wheel will move around and probably bind up between the bearing carrier and part #5. I'd like to help but it would mean pulling apart my bike which I'm not likely to do anytime soon as it's all running perfect!

Cheers
Jim