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You may get a reply but the quickest way is to do a seach from the above toolbar because this was a topic for some time. Just type in NGK Sparkplugs and I think you will find your answers there.
Not sure where to get the 18 mm NGK R8102-10 or R8108-10 but the following are NGK 14mm x 3/4" reach heat range 10. Montoya lists the ES and EG for use in 80, 102 and 302 and not listed is the EGV which is a racing type and also used. With adapters Ric recommends 1 heat range colder than what you were using. 10's are about as cold as you would need as reported by those on this site per search.
NGK type # B10ES NGK part # 7928
NGK type # B10EG NGK part # 3630
NGK type # B10EGV NGK part # 5927 presently use in my Y80 with adapter
I have found all of these at Advance Auto using the part #
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