You can get the parts you need from SJS Cyles here in England.
Go to http://www.sjscycles.co.uk and type "Silca" in the search box for replacement leather and rubber washers, and pump head and pressure gauge too.
Neil Foddering Weymouth, Dorset, England
> From: KvnMuadib@aol.com
> Date: Wed, 27 Jan 2010 11:04:43 -0500
> To: classicrendezvous@bikelist.org
> Subject: [CR] copper raleigh on e-bay and silca pump parts
>
> hi all there's been plenty of interest in raleigh pro's here's a
> well preserved lge. example that went for 1474 +, nice photos if you save
> that kind of thing...i do. i am also looking for acurent source for the rubber
> seals and leather washer that comprise the wearable parts of ye old silca
> floor pump..i'm good w/hoses and heads(i think) though any replacement part
> availibility would be appreciated.....kevin ruberg howell nj usa