Yeah, I ask for the last eight digits of the VIN anytime I'm working on non-obvious lookups.
Oil filter, sure...
15208AA100 for 4 cyl.
15208AA031 for 6 cyl.
would you like an 11126AA000 with that, or do you have a Fumoto valve?
Less obvious parts and with high dollar purchases, I want to make sure it's ALL the right parts for the car.
I had one dumbass come into my dealership...without the VIN. He thought he knew everything. He returned 3 times...each time without the VIN, and we ordered part after part. He kept getting more and more frustrated (as did I) thinking it was my fault.
He finally broke down and brought in the VIN as I had asked him to do the previous 3 times. He got the right part in two business days.