Hi,
I'm riding Liquid Force foils but the local dealer has some good deals on Slingshot ptm lower packs deals. The ptm masts are still pretty expensive. there is however the adapter that lets you use hover glide mast with the ptm fuselage. Does anyone know if the LF 2020 foil mast has the same dimension as the Slingshot hover glide mast?

It doesn't .You will be better off finding a hover glide mast and using the addaptor if you want stay cheep .However used phantasm masts are pretty cheep these days so its really not a big savings .