here are trim level and engines they come with for 4th gen civics.
some info might be wrong or missing. please feel free to add them
all civics come with antenna regardless if they dont have stereo

STD: no a/c, no p/s, no clock, no tach, no power anything. 4 sp tranny.
optional auto. d15b1 70 hp. hatch only

DX: optional stuff from STD. optional pass side mirror and wheel cover. no
power anything. 5 sp tranny. optional auto. d15b2 92 hp. hatch and sedan

LX: everything not on STD and DX. power everything. tach. standard clock and
wheel cover. 5 sp or optional auto. d15b2 92 hp. sedan only

EX (90-91): same as LX. upgraded breaks. 5 sp or optional auto. d16a6 108
hp. sedan only

SI (89-91): same as EX but with sunroof. front and back anti roll bar. no p/s. wheel cover. 5 sp only. d16a6 108 hp. hatch only

CRX. coupe only
im not gonna go into crx as this is ment for the main civic mostly

DX: d15b2 92 hp
HF: d15b6 62-72 hp
SI: d16a6 108 hp. sunroof. power everything

5th gen trim level post as well

 

Like your other thread, there's a section here specific to this chassis that has this info and more in the stickied FAQ.

 

I could not find the faq you was talking about
Could you post the link

 

https://honda-tech.com/forums/honda-crx-ef-civic-1988-1991-3/88-91-crx-ef-civic-frequently-asked-questions-faqs-1508680/