Have some questions too....
Are you sure the engine is 1600cc??? Single port 1600s do exist but personally I have never seen one in Pakistan. Or were the heads changed over to single port??
If you could share the engine number here or on pmail we can set about to decipher what it is.
What did the open element filter cost you?? I beleive its readily available given the demand from all the lads modifying their civics n rollas.......have never bothered to check on prices ever myself tho. Was wondering if I shud fit one to one of my bugs.
Did you have to get the fitting for the airfilter custom made or you got it as such? I think judging from the pics that it might fit to a bug engine directly to the carb since theres more room at the top there compared to the micro engine bay.