I have stock front and rear swaybars from a 91 Civic Si listed on ebay.
eBay Motors: Honda Civic & CRX Si Rear Swaybar 89 90 91 OEM JDM EF (item 300098711039 end time Apr-11-07 15:02:32 PDT)
eBay Motors: Honda Civic CRX Si Front Swaybar 88 89 90 91 OEM JDM EF (item 300098716188 end time Apr-11-07 15:09:40 PDT)
Should fit all Civics and CRXs (DX and Si models) from 1988-1991, EXCEPT the rear of the 1988 cars. (I think)
eBay Motors: Honda Civic & CRX Si Rear Swaybar 89 90 91 OEM JDM EF (item 300098711039 end time Apr-11-07 15:02:32 PDT)
eBay Motors: Honda Civic CRX Si Front Swaybar 88 89 90 91 OEM JDM EF (item 300098716188 end time Apr-11-07 15:09:40 PDT)
Should fit all Civics and CRXs (DX and Si models) from 1988-1991, EXCEPT the rear of the 1988 cars. (I think)