Need Paint Help
 

Need some help regarding Sherwin Williams paint. I have a 1965 GTO stripped to bare metal. I stopped by the local Sherwin Williams auto paint store to get the recommended primer and paint. Here are the steps they recommended:
E2G973 - etch primer
NP75 - epoxy primer
P30 - sanding primer
The finish would be the Ultra 7000 paint.
When I checked S/W web site, the numbers didn't seem to make sense compared to what the guy at the store gave me.
A friend of mine works for another area of S/W and can get a big discount on the paint, so I would like to use it. Are these the right numbers and correct steps?
Any help would be greatly appreciated. Bob