2nd: To answer your question, not really. You can decode the data plate - but that is limited info and will not document every option.
3rd - please don't take this the wrong way, but long term you will find that the $$$ for full PHS documentation is very well spent regardless if you keep the car or plan to turn it around for (perhaps) some profit down the road.
Perhaps you should try to put that $$$ into perspective. You are heading down a road where you will most likely be spending a lot of money toward a restoration. I noticed you are looking for the complete mono spring rear for your car along with both traction bars. That left side bar is very rare and what you seek is going to cost you some coin. Your future expenditures are going to make the PHS cost look like peanuts.
I was very, very lucky many years ago and found that exact setup at the infamous Desert Valley salvage yard in Phoenix and got it for a steal. $700
2012 Mustang Boss 302 #1918, Competition Orange. FGF replacement 2006 Mustang V6 Pony, Vista Blue. Factory ordered. 2019 BMW X3 (Titled to the wife, but I'm always driving it for her. So I'm claiming it) Old projects, gone but not forgotten: 1967 FB 400, original CA car. After 22 years of work, trashed by the guy who was supposed to paint it. I had to sell it. 1980 Turbo Trans Am 1970 Mustang fastback, 351C 4Bbl, auto 1988 Mustang GT, 5 speed 1983 F-150 4x4, built 302 1994 Chevy K2500 HD 4x4, 454 TBI