thread size for gm grease fittings?

[tryn2lrn]

I want to buy some 45 and 90 degree fittings for my Sierra. I figure it's time to grease up the suspension and would like to replace any tough to get at ones with 90 or 45 degree fittings right away. But I don't know the tread size, anyone know it or have a good online place to buy fittings? Thanks

[RyanbabZ71]

on my 00 they are 6mm

[tryn2lrn]

Thanks for the info. off shopping I go