Sadly, even if you find a helpful Nissan dealer, there isn't much available for the 180B SSS.
I am currently restoring a rusty one as well. I have a genuine Datsun Spare Parts manual which I "acquired" wen I worked at a Nissan dealership, and went through it getting part numbers for a lot of the stuff you're chasing. Took the list along to a mate who still works in the spares dept of a Nissan dealership, and all he could get for me were a couple of clips and other odds and ends. Everything else was NLA.
Most of what I have has ben picked up off forum classifieds, eBay and yahoo japan. I've been slowly collecting stuff for over 5 years now, and still need quite a few bits
Mechanical stuff is much easier - places like Stewart Wilkins / Datsport have most stuff, whether you want original or modified parts.
And how did you convince your daughter to drive an Applause ? I have an almost-16 year old daughter and have had my father's one owner, immaculate Applause sitting in my driveway since we made him stop driving last year. Offered the Applause to my daughter to learn to drive, and she doesn't want it because "its old, it shakes when it drives, and it smells"