Hello Wallypat

I don't know what the specification is.
Expert BB will undoubtedly know. Deejay is away.

Why not take the chains along to the chain shop?
That way, you're assured to get the right ones, and even if the originals
are stretched! Alternatively, they may be purchased HERE.

Fitting is straightforward. Remember that all chains have adjusters.
Two are adjusted via the one adjuster - (G) nuts.

When fitting, chains should have slight visual deflection (not tight).
If you have any problems just post us.

[Linked Image]

Hope this helps.
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JACK