If it still has the Service Tag number, searching the Dell Parts People site by service tag number may help. Dell Latitude E5550 Bottom Bases | Dell Latitude E5550 Laptop Parts (parts-people.com)
Hello from Germany!I bought a E5550/5550 with a locked BIOS and a bad keyboard a couple of days ago.After resetting the BIOS pw, install a new keyboard and a SSD the machine works fine with W11 pro.The bottom case has a "plasic issue" on the right front corner.How can I figure out the part number of the bottom case w/o tear down the complete machine?My E5550/5550 is with the INTEL Graphics onboard only. No discrete graphic adapter is installed.Seems like at least two different cases for this machine:- 01TRJX Bottom Chassis Case -33A- 0TC84N Bottom Chassis Case -00Aany hints for me in this case?Thx and best regardsPeter  
Latitude E5550/5550 bottom case part number