This is the original equipment plug , single ground electrode
can use of FR6DC+ (single electrode with yttrium + v-groove), can use FR6DTC ( triple electrode) , can use FR5DTC ( colder triple electrode) can use FR6KDE0 (dual electrode with extended tip)
can use FR6DDC (dual ground electrodes)
can use FR7DII30XT(dual iridium electrode) | 