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There is a Legacy version here.

ExtendingItem 9+

Magical 
Source GM Core pg. 237
Usage etched onto a melee weapon; Bulk
An extending rune allows you to extend your weapon to impossible lengths.

Activate—Extend [two-actions] (manipulate); Effect You extend your weapon, giving you an impossible reach. You Strike with the weapon, and you have reach 60 feet for the Strike.

PFS StandardExtendingItem 9

Source GM Core pg. 237
Price 700 gp

PFS StandardExtending (Greater)Item 13

Source GM Core pg. 237
Price 3,000 gp
The activation grants you reach 120 feet for the Strike.