Where can i get the connection plug for pioneer radio and cd car player?
Answers:
WillingtonCAD guy is on the right track with his answer since it offers the cheapest routes for you, but your DEH-515 is pretty old and you'll be hard pressed to find one with his suggestions. You'll have to bite the bullet and get one directly from Pioneer:
http://parts.pioneerelectronics.com/part.
If you live in the UK Try Halfords
I'd ask Crutchfields.com, search EBay, online classifields and audio forums, craigslist and local installers.
Go to AutoZone, and there are harnesses made by Metra you can buy too; just remember to get the ones specifically for your car brand.
if you live in the UK you can try your local pioneer dealer or you could try bassjunkies
http://ww.bassjunkies.com
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