Brother I read your article on Honda CNG and throttle body stuff you contributed a lot.
Tokico were previously made in Japan and were better than KYB since Hitachi acquired them they r made in Taiwan with complaints of leakage. Only the rear Tokico r available made in Japan.
The sad part is that KYB gas shocks for 1999 civic made in japan EXCEL-G brand will cost you 12K for front only. Malaysia ones 9K not the same as Japan but still very good.
The good news is that if u plan to keep the car they will easily last for 6 years even on village roads.
mine in 1997 city front are working fine since 2006 the rear have become soft lately since on CNG but they still dont hit the ground or speed breaker.
Rear ones are 8K for Japan and 6K for Malaysia.
Part number Front 341203 Rear 341198.
6th gen civic had the best suspension ever from Honda with double wishbone all around now you dont get them even in a 10M rupees new Accord which Honda Atlas sells.
Honda introduced cost cutting from Prosmatec shape.
I highly recommend to go for new let me know if u want any help.