What's the length of a stock 2022 rear brake line

[Gen3lover]

I'm adding a 4 inch stretch to the rear and need to replace the OEM brake line. A quick Google search says the OEM rear line is 41 inches long.
So I need at least OEM + 4" line for the stretch?

CORE MOTO | STREET | SUZUKI GSX1300R HAYABUSA 2022 ABS | REAR BRAKE LINE KIT | CUSTOM COLORS

Purchase a front and rear Core Moto USA brake line kit for SUZUKI GSX1300R HAYABUSA 2022 ABS Stainless steel braided DOT Approved, Life time Warranty, top level quality made in USA!

www.coremoto.com

Coremoto sells the extended line but it comes in a two line kit. Why do I need to replace BOTH the line to the rear master cylinder AND the line to the rear caliper?
It's just the rear caliper that's moving back and needs more slack.
Or am I missing something?

 

[sixpack577]

No, you don't need to replace both, but that's just how their kit comes.
I know you only need the extra length to the caliper for a stretch, but the line from the abs module to the rear mc is rubber too, not a complete aluminum hard line, so they replace that as well, as of course the point of ss lines is to prevent the expansion that happens with rubber lines, which results in better lever and pedal response and feel.
Core-Moto does custom lines too, so if you call them, you should be able to just buy the line from the rear mc to the caliper.