1969 Base Mustang (under hood) Question

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Hi Guys. It's been awhile but I've been at it again with my 1969 convertible. I'm trying to keep it stock looking although I have upgraded the topend. I have a question regarding stock setups. On some cars I see a little shelf/shield attached to apron located between the regulator and solenoid. What is it called? What is it's purpose? And where do I find one?
 
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