I keep a list of what parts were originally for what cars so they can look it up. My Olds has suspension for a '85 Cutlass, motor for a 70's Chevy, and a rear brake hose for a '78 Caddy among other things.
It's way easier to tell them I need a starter solenoid for a fictional '72 Ford F100 so they can look it up, rather than trying to explain what a firewall mounted solenoid is.
If I can, I search it on their website first too and then just show them my phone.