Don't know anyone that makes 50mm cranked masts/ swan necks .. (except us
)... a local engineer could charge you quite a bit & they are not 'that' easy to do as one off's, unless you are not bothered if they come out dog legged- a pipework company somewhere might do them as a product but they'd be even dearer if it's for the pipework game.
The 30-32mm sky cranked poles are pretty tough though- they are made of higher tensile steel like the Raven AZ/EL brackets on the dishes & are also thicker than most of a similar O/D you see.... (really nice stuff, steel wise)
... how big is the dish & how far do you want to project it?