I hear ya and felt the same way until I found these guys. I've done one order already and am quite please. They sent a catalog with the order and what appear to be exact matches for a number of hard to find items are in there.
Might be worth considering. https://www.amkproducts.com/
Ok thanks for the help I went on there site but they don’t have any pictures of the products unless you get a catalog. What parts did you order from them.
Here's a photo of my order, a picture of AMK's horn bolt, and a picture of the same from MCC Detroit's E body Reference Manual (which I think is indispensable).