Don't lose confidence in Toyota parts - they are still excellent, but somehow, seems many people including the dealer service departments apparently, do not follow the factory service manuals regarding non reusable parts. You're doing the right thing. I always replace those parts indicated non reusable. Recently replaced the passenger drive shaft and there were several non reusable parts that needed to be ordered specially, and I'm glad I did because the old part had been reused once already - by a prior mechanic and that "bearing lock bolt" was missing the neoprene tip which actually held the bearing from rotating. I think they reused the cotter pin on the tie rod end, too. ( I made a point of having the new cotter pins and snap ring on hand prior to starting the work - I'm sure the original snap ring was reused the first time - who knows if that's a problem, but it does hold the axle in place, so there's a new $19.93 snap ring from the dealer in there now) One of the benefits of doing your own work is that you can take the time and care to do it properly. Parts are still first quality, you just need to be aware to order those non reusable parts separately. "Distributor packing" is another one I suspect gets changed rarely, though listed non reusable.