I purchased Mugen headers a couple years ago and had the same problem. I returned it back to the seller.. I did eventually buy one. If the holes/studs don't line up the headers are not for your engine. I still have my mugen b18/b16 headers in the garage. I can measure the holes for u if you want to compare? I've already had the header on my b16a2 so I know it fits
if they the gasket done fit maybe its for somthing else post a pic maybe from H22a or somthing only way to know is if u post pic and measure the stud holes and post it
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