74 Sunroof Charger. Headliner help needed!

[74ChargerSE440]

So, I ordered a sunroof headliner at SMS a couple of months ago for $495. Today I received a message that reads? Do you want a 6 or 4 bow headliner? I know mine has 2 bows, but I am now wondering if they can pull it off... Only they have the correct original fabric as far as I know.

Does anybody know who has the correct headliner template or knows the measurements of the placement and distance between the bows? Has anybody installed a new headliner for a 73/74 sunroof Charger and what are the lessons learned? Does anyone know a upholstery shop with the correct knowledge and experience?

Thanks!