I have a 92 GSR tranny that the third gear sleeve and hub is destroyed, i priced the part and its $270, the part number is 23442-PS1-N00, which is also the same part number as the third gear sleeve set in a 93-97 Delsol Vtec, but not the same part number as the 99-2000 Civic Si.
The only thing is the sleeve set for the 99-2000 SI is a $100 cheaper, but im pretty sure i have used parts from one to the other, just can't remember if the hub is the same diameter and i don't have one here to compare. Part number on the 2000 SI sleeve set is 23623-P21-315.

Anyone have any insight here, i searched but couldn't find anything on this.
Thanks

 

still looking for information, if someone even had some parts they could compare kicking around that would be great

 

for some reason, acura sell 3/4 sleeve set with either 3rd or 4th gear. you can't buy just the sleeve/hub/synchros/synchro springs. honda sells the entire synchro assembly without a gear...hence cheaper. and del sol b16 and 99-00 si are all the same part as well as for your 92-93 gsr. they may have different part numbers but are interchangeable.