where can I get a small piece of 8 or 14 mm aluminium plate?

The 1UZFE EGR Delete Kit is available for sale here.
What I actually need is a piece of 14mm. I have some 6mm here and was going to use a second piece of 8 mm sandwiched with it to get 14 mm( it's for a spacer).
So I could use 4 and 10mm if its easy to get or 7 and 7mm.
Any suggestions??
 


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