PS questions


Should be some easy ones for you guys to answer. Shown in the first pic, the power steering pulley has a raised center, is this design based on year or engine size? I've never seen one that looked like this and can't find any part numbers on it. Pre 63? 6 cylinder? V8? I have seen the one in the second picture that dishes inward which my 63 had so I'm guessing 63+ 6 & V8?.

Secondly, I noticed 2 different style caps. The one in the 3rd pic has 2 raised lines and the last pic it doesn't. Is that a year specific design?

ps1.jpg ps2.jpg ps3.jpg ps4.jpg