Spark Plug Confirmation

[lalijaca]

Starting to think about doing the service ready for the summer here is Oz, even though it is mid winter.
I have pulled a couple of spark plugs out so I can look at buying new ones. They are an AC Delco plug with the following numbers that I can read. It looks like the plugs have not been changed ever. The boat is a 2007 21i and engine is a 2006 Marine Power 340HP.
Numbers are:-
126072
PTR4G-15
11-993
Are these numbers all correct, or can you tell me what the correct plugs are.
Also, it also looks that the leads are the orginals, do you suggest that these also be changed. The boat has done about 300 Hrs.

[dom w. forte]

Usually its a 41- 993 ac and I dont see any reason to change plug wires unless they show signs of damage or corrosion, however check the cap and rotor for corrosion.

[lalijaca]

Thanks heaps.
I am going to change and put in NGK PTR4B-15.