Some Lowrance Hook2 series fish finders use a unique star pattern mount that plugs into the back of the head unit. Hook2 specific RAM mounts are now
RAM Mounts B Size 1 Composite Fish-Finder Mount for Lowrance
Railblaza Fish Finder Mount R-Lock R Black
YakAttack Lowrance® Hook2 Fish Finder Mount
YakAttack - Lowrance Hook2 Fish Finder Mount – Frontenac Outfitters
YakAttack Lowrance Hook2 4 and 5 Fish Finder Mount LockNLoad
YakAttack - Lowrance Hook2 Fish Finder Mount – Frontenac Outfitters
RAM® Track Ball™ Double Ball Mount for Lowrance Hook²
YakAttack Fish Finder Mount for Lowrance Hook & Elite - HWS
Lowrance Hook2 Fish Finder Mount
akAttack Lowrance Hook2 Fish Finder Mount with Track Mounted
Yak Attack Fish Finder Mount Lock N Load System, Large