125-200cc Replacement Wheel Spacer Material?

Looking for some advice on this.....

Going to have some replacement wheel spacers made for my 04 CR125, just wondering what the best material would be to use?
Should I stick with aluminium, if so any suggestions on what grade to use?

or

Would it better to go with stainless? Obviously heavier but the seal wouldn't wear grooves into it like the original alu ones, but I guess the seals would wear rather than the spacer?

Any thoughts?

Also attached drawing, may help someone else

I'd go stainless TBH, wow so it may weigh a few more grams than aluminum but, as you stated, it will last longer!!

Been running the stainless spacers for years & they still show next to no wear!

I machined new ones out of 6061 T6 aluminum, but I have time, and material, so I can make them again if they wear. If the weight is not an issue, SS is the way to go

Weight difference will probably not have much of a huge effect on unsprung weight. Personally when I have to machine spacers up I usually head to my local engineering supply & see what offcuts he has!

Either material would work well!

Thanks Guys I'll go with what ever material is available at the time.

I have them made out of SS and they are holding up great, I can notice some polished rings were the seal lips lands but no grooves for now ! Definitely a must do, the Alu ones (Zeta etc) will only last a few weeks before grooving badly.

http://www.cafehusky.com/threads/front-wheel-spacer-size.85395/#post-596203

Regards.