go to : https://wiki.gtanet.work/index.php/Peds
grab the hash of the ped you want to use, the hash is the numbered value :  Hash: -245247470
then in personaldriver.ini 
set DRIVERMODEL to the hash, so for my hash it would be DRIVERMODEL = -245247470
then you need to set USERANDOMDRIVER to false, so it would be USERANDOMDRIVER = false

so in the end your ini should look like this 

[CONFIG]
DRIVINGSTYLE = 1
ACTIVATEKEY = l
USELSHIFT = false
USELCTRL = false
USECONTOLLER = false
UICONTROLLERINPUT = INPUT_CINEMATIC_SLOWMO
CONTROLLERINPUT = CinematicSlowMo
DRIVERMODEL = -245247470
USERANDOMDRIVER = false

[SETUP]
NORMAL, DRIVINGSTYLE = 1
RUSHED, DRIVINGSTYLE = 2
SOMETIMESOVERTAKETRAFFIC, DRIVINGSTYLE = 3
IGNORELIGHTS, DRIVINGSTYLE = 4
AVOIDTRAFFICEXTREMELY, DRIVINGSTYLE = 5
AVOIDTRAFFIC, DRIVINGSTYLE = 6
'CONTROLLERINPUT' CAN BE (WITHOUT {} OR , = {Context},{Cover},{ThrowGrenade},{Sprint},{CinematicSlowMo},{VehicleDuck},{Reload},{Duck}
'UICONTROLLERINPUT' CAN BE (WITHOUT {} OR , = {INPUT_CONTEXT},{INPUT_COVER},{INPUT_SPRINT},{INPUT_CINEMATIC_SLOWMO},{INPUT_VEH_DUCK},{INPUT_RELOAD}.{INPUT_DUCK}
'CONTROLLERINPUT' CAN BE (WITHOUT {} OR ,): = {Context},{Cover},{ThrowGrenade},{Sprint},{CinematicSlowMo},{VehicleDuck},{Reload},{Duck}
'UICONTROLLERINPUT' CAN BE (WITHOUT {} OR ,) = {INPUT_CONTEXT},{INPUT_COVER},{INPUT_SPRINT},{INPUT_CINEMATIC_SLOWMO},{INPUT_VEH_DUCK},{INPUT_RELOAD}.{INPUT_DUCK}

