On Saturday, July 1, 2017 at 3:00:07 PM UTC+3, James Thomson wrote:
At 20:21 30 June 2017, wrote:
Pls also find one for an Aviat Husky and someone who is willing to
sign
off=
on the installation at the FAA without causing the airplane to be
downed
i=
n the weeks and months of waiting for the paperwork to be
processed. Or
ju=
st ask Husky to quit making available their type certificate approved
tow
h=
ook and release installation so we can use 4313 to produce our own.

Thanks

Tost offer their EASA approved retractor winch for a variety of aircraft
including the Husky A1, A1-A, and A1-B. They also offer the tow
release support alone for some aircraft including A1/A1-A and the A1-B.
It is an approved part of the EASA kit, not certified in itself. It may
be
worth contacting Tost for clarification.

Tost don't offer a kit for the L-19, possibly the USA is the only place
where this ex-military aircraft is used as a tug.

A L-19 was towing at Omarama NZ in 1995. I would be very surprised if it had anything other than a Tost hook.

According to http://www.kiwiaircraftimages.com/birddog.html (last update 27 May 1999!!) there are four in NZ:

O-1A 53-8031 (c/n 23452) formerly ZK-DOG (registration cancelled 31 Jan, 1997) is stored in Auckland with Mackley Aviation following an accident at Lake Hawea (Easter 1996).
O-1A 51-12520 (c/n 22975) VNAF 3-04126 is currently under restoration in Auckland.
O-1G ZK-FYA (c/n 22737) formerly 51-16903 is airworthy with Birddog Aviation at Ardmore.
O-1G ZK-OIG (c/n ??) is airworthy with J.S.Gemmel at Ardmore