clutch slave cylinder o rings

[CLEMTOG]

I have got a '79 anniversarry apart at the moment, it has stood unused for a long time (missed the ball/roller main bearing recall, and packed up 14 years ago) and a lot of things are seized up.
I have got the clutch slave cylinder apart and find that unlike most triples with a hydrauilic clutch it does not have a 30mm or 31mm piston it has a 35mm (!!) I have heard that 37mm was also used, but never seen one, well now I have a 35mm in my hands, to get the piston out I had to screw an angled greese nipple into the hose conection and pump it out with a siedelever greese gun, but it came out undamaged.The question is, where (in UK) can I get a single O ring  which is brake fluid proof (EPDM?) to fit, I presume its 3,5mm thick so 28x35 is the size, any offers, not Wolfgang (no stock) not Slaters not Motalia etc.
CLEM

 

[Laverdalothar]

I can add a 34mm piston to the list... 

can't tell for the O-Ring sources, but if you can't find one, I can check and send you one

 

[MotoV]

Bearing suppliers often carry o-rings, although I had to buy 10, a 3 lifetime supply... :'(

 

[Rob]

Clem - you need to check that cross section to be sure.  No luck with 3.5mm (or just 1 off!), but 3mm or 4mm is here

http://www.altecweb.com/home.asp?cat=Subcategory8430b

The alternative is to buy some cord and make your own

 

[nealebms]

clem
3.54mm is a BS standard cross sectional size 3mm or 4mm are metric sizes.kent bearings maybe able to help
neale

 

[Simonr501]

Not a problem Clem,
Brammer in Ashford, Kent: http://www.brammer.co.uk/uk/south_eastern_region.aspx
London Bearings Kent (LBK)-Sittingbourne: http://www.lbk.co.uk/contact.html

I have used both for years from work, not cheap but can get almost anything in the bearing and seal field.

 

[cape]

Not in uk, but instandhaltung24.com from Germany does have a lot of epdm o-rings and they are cheap.