Had one made up to original pattern by my local exhaust fabricator - cost was very reasonable £160 I think.
Whilst you are at it, consider redesigning the exhaust mounts, a 1969 car (assuming it has not been modified already) has a right angled bracket of mild steel with a single bolt.
The single bolt becomes loose over time and causes a nice star crack to radiate from the bolt hole!
Ideally, you will need two bolts arranged vertically to secure the bracket to the chassis and some sort of bolt plate (i.e. two bolts welded to a piece of steel strip at about 2 - 2.5 inch centres) on the inside to distribute the clamping force over the chassis rail.
Arwyn
