Is this part still needed for Technic models?

Yes, this pack of 3 connecting leads is specific to the Technic theme and can complete older 2002 builds.

What is the rarity of the 970115-1 set?

As a 2002 Technic component, this set number suggests it is a specific, older piece sought after by dedicated collectors.

This listing contains exactly 3 pieces, which are the 1280mm connecting leads.

Name: LEGO 1280 mm Connecting Leads (Pack of 3) (970115-1)
Brand: LEGO

Technic

Technic · 2002

Theme · TechnicPieces · 3Set Number · 970115-1Year · 2002

Used

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New / Sealed

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Is this part still needed for Technic models?: Yes, this pack of 3 connecting leads is specific to the Technic theme and can complete older 2002 builds.
What is the rarity of the 970115-1 set?: As a 2002 Technic component, this set number suggests it is a specific, older piece sought after by dedicated collectors.
How many pieces are in this listing?: This listing contains exactly 3 pieces, which are the 1280mm connecting leads.