After searching high and low, i cannot find any 90209-06061 cupped washers online at sensible prices (these help attach the rear exhaust tail pipe to the bracket). Yambits have M8 cupped washers but these little guys are M6.
(there are some on ebay but they want crazy money ie more than 10 quid each)

i am currently trying to find skateboard truck washers but they are M6 it seems.

Any thoughts on where to get some?
Thanks all, and HNY25
David
 

I'd need to do exact measurements to confirm, but the cupped washer that sits in the rear light bracket to mudguard mount bolt on the earlier enduros looks the same size, although the finish is different.

There have been one or two part supersessions, but hopefully the photo on the link below is what you get. Postage to Oz will probably scupper the deal, but you might find some over there.

I'll report back when I've measured the items on my DT360A and RT2, for comparison.

Yamaha DT3 1972 1973 USA TAIL LAMP - buy original TAIL LAMP spares online

 

Just checked.

As close as would make no difference, at around 23mm outer diameter.