I still have stocks of the original "Western Body Hardware" auto-latching bonnet stay.
This holds the bonnet up, automatically latching when the bonnet is opened and releasing with a second upwards movement.
It also provides support against the wind blowing the bonnet forwards, which a conventional strut doesn't.
A further refinement is to use a wing nut on the bolt at the top of the strut, which when coupled with a sprung bonnet pin, makes it easy to remove the bonnet single handed.
Unfortunately, I can't find a photo of this strut in a Midas, but this is the WBH catalogue image:

- Auto latching stay
- item_130375838_216420.jpg.jpg (21.67 KiB) Viewed 11132 times
My stocks are finished in the yellow ZPP - Zinc Plated and Passivated - and come with one end bracket which fits in the recess on the underside of the bonnet.
The other end bolts to the side of the engine bay, usually spaced off with a penny washer.
The stays themselves cost £9.50 each.