Pretty much the only "vacuum" lines I have on my desmogged '91 are the distributor (hose from airbox to distributor, then to a connector on the right hand firewall), the fuel pressure regulator (from the manifold to the vacuum switching valve to...
I got noticeably more front flex on my '91 by ditching the front swaybar. I haven't noticed any poor driving charcteristics like excessive lean in corners, but that's probably because I drive a brick that doesn't go very fast. After driving it...
I also think those are fishing rod holders, but if they were lights, with the way they're aimed, I might call them "ditch lights", although most 80-series ditch lights I've seen are mounted on or near the side mirrors.
The hood spacers from Outsane work really well for me. It looks a little funky with the back of the hood spaced up, but it makes a noticeable difference. If you're not a fan of that look, you could put some louvers on the hood (search the forum...
How did you discover it was "not the right one"? It sounds like the one currently in there is working fine. Maybe I'm not getting the whole picture, but it kinda sounds like a case of, "if it ain't broke, fix it 'til it is". What issue are you...