Iridium plugs for a SP6 engine.?

[TailEndCharlie]

Are there any iridium plugs on the market for the SP6 engine.? Cerbera.
If so can somebody tell me the code number for them.
Ta.

[TailEndCharlie]

Thanks Tam.
Why the different gap.?
Dave.

[TailEndCharlie]

TAM747.

Just wondering why you change the spark gap.?