I spoke with someone on the phone (please forgive I forgot his name), and we discussed my needles for upgrade/replacement springs for my f350. He was very knowledgeable and gave me exact specifications for the springs I ended up buying. It was nice to be treated respectfully, and I felt like a valued customer. I received the springs quickly from a competent fedex driver, and I’m very pleased with the quality of the product. I’m installing the springs at this very moment, and my only complaint is they are HEAVY! That’s obviously a good thing. The build quality is great. I’m stoked with the whole transaction, and will definitely be a return customer. Also you’ll get some free marketing from me because I’ve already bragged about your product. Keep it up guys, thanks a bunch! -Yeager