Hi all,
it comes out of time, but i´ve just arrived on the forum because of the same issue, 1947 A7 being restored at the moment, no photos yet. Attached you have the only schema i found of the drop-down stand, and two pictures of how it looked, and will be very difficult to find these parts. Third time in Kempton Park and one time at Stafford lead to nothing, so will try to do this as similar as possible to the schematic, please post or pm some photos of your bikes, specially focusing the center stand and where you have the found the parts.
Regards,