1971 DEMON......4 OR 6 ROOF BOWS?

Hi Folks

I have an April built car and was wondering which system it would use. The bows mount in the little holes, and NOT the cups as seen in a 1970 Duster. The car came in a pile without the bows. I can use either system, but I would like to know what is original and/or better........And/or easier to install.

Thanks FABO