I guess you were using the "Calchi Final carshape 2000". I still have the Zip file if you need it. But you can also transfer the old carshape and camera settings from GP3 to GP3 2000 with the carshape editor. Just use a version no earlier than 3.7 and follow the instructions below.
Load the carshape and camera angles from gp3. Then export/save it to CTF format. Restart the carshape editor, and set it to edit your GP3 2000 version. Then import the (original or current) carshape from the GP3 2000 exe file. Then import the CTF file you just created before, and export it to GP3 2000.
Be careful though! The carshape might not be compatible with your exe file. Also, the old carshape might not fit the new liveries. Your cars might look like they are wearing clothes 2 sizes to small. The carshape and the camera angles are ALL stored in the EXE file. So remember to BACKUP the EXE file before you begin to experiment.
It's only after we've lost everything, that we are free to do anything.