Post on Yelp, Google+, and any site that lists his business and write a negative review. Perhaps facebook and you name it.
Simply search for Vintage Performance Developments and John Parker. His name comes up, and not in a nice way, for other Europa makes and models where some have done work for him and he's not followed through.
So, write your opinion. Warn away other that have suffered this person's poor something something.
Also, folks should post to the BBB!!!
I read complaints about John Parker, yet I'll not ever race again or do performance upgrades, yet no one posts to social media or to the BBB. So, to either get this guy to follow through, or warn away other from getting screwed by John Parker and his Vintage Performance Developments, use the available means to get him to follow through, get you parts and money back, and / or warn away others.
You also have more than a few threads on this John Parker matter brickboard alone.
Hope that helps.
Duffed.
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Jonathan Harshman Winters III: The Mightiest, Greatest, & Most Powerful Comedian & Comedic Actor North America in Perpetuity
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