i have always fitted NGK zfr5p-g plugs.

What alternatives would you trust?

I am ordering some service parts on-line and they are not being offered as options on the site i am buying from.

Should i just stick to those and source local?

Personally I use NGK across the board from chainsaws etc up to cars. Never had a bad one and they do last. I would stick to them. I have heard that denso are equally as good but never tried them.

Alasdair