Nice. I got 10 feet for $16.48:

https://www.amazon.com/gp/product/B01D5H91KE/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1

https://www.amazon.com/gp/product/B00C7SA21U/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1

6 feet probably would have worked okay. I basically use the extensions to relocate the center of my room-scale, and the 10 or 11 foot headset cable to move around that axis.

I'm using this set with no issues so far with the 5k+: https://smile.amazon.com/gp/product/B00C7SA21U/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&psc=1

https://smile.amazon.com/gp/product/B00L1K1KDE/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&psc=1

https://smile.amazon.com/gp/product/B00FT9VW0O/ref=ppx_yo_dt_b_asin_title_o03_s01?ie=UTF8&psc=1