Model and year differences
 

It appears both of the links in the FAQ page are broken at this time. I was curious what the difference specifically for an 83 GSL and LE are, but I also would like to find a new reference for this information or create one here. I haven't had any specific luck searching.

the LE got special wheels

im not certain about this but I don't think the LE's had lsd/disc rears like the GSL's had

LE's also got special "Limited Edition" badges behind the doors where the GSL had the "GSL" badges

All the links are down and it sucks because ive always read them on my free time prepairing to buy an fb. Thankfully enough people visited the site so it was saved on way back machine. Ill add more links as i recover them
https://web.archive.org/web/20010506155345/http://www.solarwinds.com/jdbooker/rx-7faq/

Edit:theres also this
http://www.rx7.org/public/1st-gen.html

we've put all of the manuals we know of up on Foxed.ca

so the 1983 LE, the LE was an model based off of the GS. mechanically it is a GS, so its the 12A, open diff, rear drum brake. cosmetically, its a unique Chateau Silver w red pinstripe exterior, over a red interior with a unique cloth insert. being a GS, it is power mirrors, cruise control, sunroof, am/fm/cassette, and AC. manual windows, and no rear wiper. it came on 14x5.5" BBS wheels with 195/60/14 tires, which was the big change

i had one, and i really enjoyed it, it was just right.