Ducal wroteRighto Steve
It bolts through the water coolant blanking plate ( on the throttle side of the bike on the horizontal cylinder ) and provides support via an carbon 8 shaped plate to the bottom radiator mount. So male thread into cylinder and female at the other end.
Are you sure it's the bottom rad' mount?
On all the bikes I've seen it's one of the battery crate mounts.
The bottom rad' bracket usually mounts to a lug* on the frame above the battery crate.
Edit...*The Pierobon '94 SBK frames have this lug.
https://www.pierobonframes.com/en/product/888-sbk-94-frame/
Steve R