Factory Service Manual for '92 Sentra or NX with SR20 or GA16. The manual covers both bodies and engines. It should be that same for 91-3 on the SR if I remeber correcly. I checked and they are $85 (without shipping) new. Mine (see pics) is in great condition, no tears or missing pages. $65 plus shipping, I have a paypal account or I'll take a money order. I can ship UPS from my work so I can provide a tracking # as soon as it ships.
Email me if you are interested:
EMIAL (gabe@sparcousa.com)
PICS (scroll to end of album) (http://www.imagestation.com/album/?id=4286157455)