Since this is all new to me, ordering many components, I didn’t realize about the color differences, and found the specified black phone jacks after much searching, and bought almost the last ones, which are now out of stock, here: https://www.onlinecomponents.com/en/keywordsearch?text=SJ1-3535NG though some of the other colors are still available. Now that I know, blue would have been totally fine, too. At the time, of the items Mouser showed as backordered, only the TI shift registers were listed as having a very long lead time, but then they came in stock a week later, so it’s all a bit unpredictable. Those resistors you mentioned were available at Newark. I’m still working up to knowing what would make a good alternative for specified parts, but hey, now we have a forum where these things can be discussed, which is great!