Vintage Simmons Drums (UK) Users Group

Just received 3 Simmons pads off of eBay. These are the original SDSV 
series pads with the riot shield surfaces. The seller did not disclose 
that two of the pads have holes in them and the third one has a home-
made replacement surface on it. Luckily the seller is being good enough 
to work with me in resolving the issue. My question is: Does anyone 
know where I can find the original riot shield replacement heads or 
where I can find the material to do so? Thanks, and any help would be 
greatly appreciated. - Roland