This is timely. I just restored every single part on my 88, and an 89 is disassebmled. I think for the 89 I'm going to try my hand with automotive grade paint, so I've been looking for the 88-9 frame, and a-arms paint color. I've reached my end with PC.
An easy option for 86-7 engine/cyl is Duplicolor Storm Gray. It's a perfect match against a new OE part. Keep in mind that old parts will be faded at least somewhat, so not a great comparison.
One thing I'm not sure on... "Olive drab with the addition of 10% black chromium for all steering stems, grab bars, both brake levers, handle bars 88-89 engine bolts etc etc."
I think the handlebars, levers and grab bar, same as 88-9 spindles and engine cases were painted black. Rustoleum satin sheen from a spray can is a pretty good match to a new OE cases and is pretty durable. I use it for the other parts too. I've tried semi-gloss for teh bars and levers, but I don't think any of the painted, black parts were that glossy when new. If I'm wrong, I'm pretty confident the difference is subtle.
The rest mentioned I think were black zinc coated. For example, if you want the black JIS screws for the handlebar lever clamps (discotinued by Honda), you can go here and get some in black zinc, and it will resemble that greenish black on the stem, etc:
https://www.japanmotonuts.com/product-page/jis-screw-countersunk-oval-head-1