You will have to find a junk yard with a Jeep that has a bad engine to be able to get this part. Hopefully there are many models with a similar dipstick tube. Take your old one with you even if it is in pieces. Other than that you will have to go to the dealer.
There are many websites where one can find details of the Jeep Grand Cherokee Laredo. One can find details of the Jeep Grand Cherokee Laredo on the following websites: Jeep, True Car, and Yahoo! Autos.
Warped brake rotors. This is a very common problem for the 1999-2004 Grand Cherokees. You will need to have your rotors replaced, or resurfaced. The best resurface method is with an on car brake lathe.
Older Cherokees have a pressurized overflow tank on the left side of the engine (facing the engine) near the firewall. There was a retrofit of a lower pressure relief cap for the overflow tank BUT the thermostat must also be replaced with a lower temperature setting.