Hub Spacer Advice Needed

I have removed a set of wheels from my best bike which will now be used for my winter ride. However, the wheels have an 11-Speed hub (Ultegra 11-speed cassette currently fitted) but my winter bike is 10-Speed.
Please can any point me in the right direction of where I can buy the correct spacer(s) I need to run a 10-speed '105' cassette on these? Any internet links direct to where I can get these would be fantastic
Please can any point me in the right direction of where I can buy the correct spacer(s) I need to run a 10-speed '105' cassette on these? Any internet links direct to where I can get these would be fantastic

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Posts
This will do the trick - may need two or three though depending on your free hub. Just add these at the back so it takes out all the slack then re-index your gears accordingly.
Hi Garry H,
PM seems to be out of action at the moment.
I would be keen to buy the spare you have. Please email at...
Philrhodes (at) btinternet (dot) com
Thanks everyone else for your input too.
Cheers,
Phil