rearviewmirrorstore.com is actually my site. I was just checking on visitors for the day, and I saw someone was directed there from w-body.com. I was like.....what?! Then I came here and found this.
That's a pretty rare mirror you linked to. As far as I know, they were an exclusive option in the Dodge Stratus, and as you can imagine, there's not a lot of those in the junkyards anymore. It's what I call my "grand daddy of them all" mirror, as it has pretty much every feature other than a back up screen, thus the price.
You're actually pretty limited on choices if you want auto-dimming with map lights. Donnelly made them, which were even found in 2nd gen Regals, but Donnelly mirrors are garbage. The auto-dimming gel is pretty much guaranteed to break/leak at some point, and I'm guessing the gel must be acidic or something, because eventually, they start deforming/eating through the plastic housing of the mirror. I have seen this time and time again in the junkyards and in the w-body community. Have helped several GTP owners switch from their Donnelly (no map lights) to that mirror in your last pic. Very easy swap.
Another option is the optional 1st gen Sebring convertible mirror. Same mirror was available in the mid-'00s Lincoln Continental and Olds Intrigue GLS, except those had a compass as well. The problem with any of those, as me and Sean have talked about numerous times on this site, is that they require a BCM to kill power to the mirror after X amount of minutes. Otherwise, those mirrors will have a continuous draw on the battery. Enough so that they could kill the battery if you don't start the car after a few days. These are the mirrors I'm talking about:
https://rearviewmirrorstore.com/products/gentex-auto-dimming-mirror-with-led-map-lights
https://rearviewmirrorstore.com/products/gentex-auto-dimming-mirror-with-led-map-lights-compass
There IS another older option that many don't know about for auto-dimming and map lights. They were an exclusive option for the '90s Chevy Caprice and Buick Roadmaster, so they'd be period correct for your Z34. Only downfall is I believe they use the tension spring mounting instead of a torx screw. I have a few that are still sitting around. This is what they look like: