Z1OwnersClub GB

I know I asked this question before but cannot remember the replies
What size spacer is needed when you fit a set of mag wheels to a Z1000 that originally had wire wheels fitted
The spacer I am talking about is the one on the brake caliper side

35.5mm
(always good if you can get somebody else to confirm / agree but this size should be correct I believe)
On the odd occasions in years past I've found the odd c. 0.5mm thick washer fitted in this position just to get the disc centralised in the calliper slot but we're talking 45 year old bikes / mixtures of components !