I was nearly going to post that if you had the sliding type locks, it should have central locking, as they were only fitted to central locking cars prior to 1985 (in about April 85 they made them standard, as a theft deterrent measure, but prior to that it was only with central locking).
The SL/Es without central locking had the regular vertical "pin" type lock buttons on the top of the door.
As far as the aircon switch - it's the same as any other VH Commodore (and VC air international A/C) which is a 3 way (centre off) rocker switch that has norm and recirc written on the switch. Here's an example on gumtree:
http://www.gumtree.com.a...-dash-switch/1117626453
The crashpad is a tough one. There's nothing available as a repro, and more than 10 years ago Holmart were selling "NOS" ones - but they were VK.
Only a VH crashpad will suit - VB/VC have an additional hole/relief for the RTS badge that was removed on VH. They also don't have the holes in the metal brace for the speakers.
VK has the holes in the metal (foam only cut out on Calais) but is different at the perimeter of the binnacle opening, and doesn't work in a VH (trust me, I tried after buying the NOS Holmart one & finding it was VK).
You can source one from any VH and simply cut the holes with a kitchen knife (that's what I eventually did), but even good 2nd hand ones were scarce in the late 90s, so they'd be hard to find these days. You may have to bite the bullet & send it to a dash restorer. I've heard good things about one in Adelaide, and the example of their work in a VC Brock was impeccible, but there's also a lot of horror stories, so ask around for happy customers before sending it anywhere.
