Every do it yourself mechanic should build a relationship with their local independant parts store, It may cost a few bucks more than the chain stores but when you have a problem and the kid at the chain says thats what the computer says it's good to be able to talk to someone that knows parts. Sadly a lot of the old timers are retiring but there a lot of sharp younger people still behind the counters. I have been dealing with the same parts stores for close to 50 years, I have the owners home phone numbers if I need something after hours, Rarely used but invaluable. Chains have bought out a couple of them and won't sell to you without a commercial account, I guess cash isn't what it used to be, 1 of them cancelled my commercial account because I wasn't buying enough parts