A good place to buy genuine replacment parts for your BMW is from your local BMW dealer. They will likely carry what you need in stock and if not be able to purchase it for you.
You can find genuine Volkswagen auto parts online at http://www.vw-auto-parts.com/.
Genuine GM auto parts can be purchased at Pepboys, Autozone, and any Chevrolet dealership. There are also websites where you can order genuine GM auto parts.
Most local and online auto parts retailers would carry replacement parts for a 2003 Toyota Camry. Parts can also be purchased from warehouse auto parts retailers as well.
O'reilly is a good place and AutoZone is another good place to shop for replacement auto parts also, you could check with a good salvage yard if they have the right parts you need.
Genuine parts company - gpc
I always believe that if you are replacing parts you should use the genuine auto parts for replacement. I think that it would be extremely kind of you to purchase some Chevy Silverado parts for your brother, and I am sure he will appreciate it as well.
Kaiser Willys Auto Supply is the biggest supplier of genuine Willys parts, for a range of models from 1941 to 1971. VintageJeepParts.com is another source for genuine parts. There are also dealers who sell reproduction Willys parts.
Replacement parts are parts you get to replace the broken ones on your car. They are available both used (from junkyards) and new from auto parts stores.
Honda auto parts has long been a reliable trusted company. It is recommended by Honda to use genuine Honda auto parts. And you should check your vehicles warranty information before making a purchase it may be covered under warranty.
You can buy replacement parts for your Camaro at any auto parts store in your area. You can buy second hand parts at some local junk yards for far cheaper than buying new parts.
There are a few different replacement parts that can be purchased from Autozone Auto Parts. One can purchase new windshield wipers, new engines repair kits, and a tire jack there.
If you are looking for 1964 Chevrolet Impala SS replacement parts you should look at Auto Zone, O'Reilly Auto parts, Napa Auto Parts or Pep Boys. You can also contact your local Chevy dealer.