They are said to be from the Sprite but stainless. Rear brackets were available from the factory to adapt from bumper as I recall but at the front you will probably need the factory brackets which will be £££££.

This doesn't look quite the right shape in the photo.
https://www.ahspares.co.uk/austin-healey/sprite/Bumpers/BUMPERETTE-rear.aspx


DaveW
'05 Red Roadster S1
'16 Yellow (Not the only) Narrow AR GDI Plus 4