I'm getting my 2006 Four Winns ready to put away for the winter. The engine is a Volvo Penta GXI-E. It has 300 hrs on it so I figured new plugs are in line this time. I pulled an original and it was an AC 41-932. I found out that the 41-932 has switched to a 41-993. No problem except I noticed after I purchased them that these are iridium plugs. I have no problem putting iridium in but I want to know that its safe. Also, the box says to gap to manufacturers recommendations. The 41-932's were supposed to be gapped at .060. Will this be the same for the iridium?