The unconnected washer outlets in the scuttle were factory original.
Washer bottles are documented as being a dealer fitment, usually fixed to the left inner guard, and usually Tudor brand, but not always, depending where they were sourced. The jets were manually operated by a hand push pump that I've seen mounted through the dash beside the lower corner of the small gauge panel, or via an underdash bracket. You could dislocate your thumb from the resistance pressure of the hand pump on cars I've had.
A useful update is to instal a period Lucas electric washer with the square glass bottle, as used in Mk2 Jags etc., which holds much more water and provides a decent spray.
Viv.