Mk IV Spinner Bolts (Original Skystar one)

Hi All,

I'm trying to be really proactive and get everything lined up for the annual inspection later this year.

One task that I'd like to do is replace the small silver Phillips head bolts that attach the nose to the spinner back plate. My main reason being that every year there is one or two that are really difficult to remove as over time the heads are getting rounded.

Does anyone know what size (or ideally part number) these are?

The prop is a 3 blade GSC (68inch I believe) with the kit supplied spinner of 1990's era.

Thanks

Jono