Pins for my set up

Hello all and I have bin searching for any information about my vehicle and the pin types I need for my connectors. I drive and am working on a custom wire harness for a ford focus st now I know best types of mechanical splicers are the brass te crimps but for my vehicle how do I find the information on the type of pins for all of my engine connectors so I don’t have to just cut the connector and splice it the wire harness.