Conversion ring and hub size

[Gusgusa1]

I am thinking about putting my stock 16" aluminum rims off a 2002 3/4 ton 8 lug on my 1987 1/2 ton 4x4.
I'm looking into the conversion rings to convert from 6 to 8 lug.
Has anyone used these? Or should I even bother because if the 8 lugs center hole I'm not sure if it's too small because I am 2.5 hours away.

Can anyone help?

I would like to keep my six lug option as well.