Sport, my kangaroo is getting tied down on this at the moment.
Waiting on a reply from Brownell's Australia.
They have, in stock, Remington 1 1/8 Oz wads in plastic for taper wall cases; That is compression formed cases.
They think there may be old stock for straight wall cases & are checking on that for me & will email back that info.

As you mention Shotgunjones, Winchester do make 16 gauge loads here but for some reason their web site does not offer 16 g wads.
Strange that.

Lagopus, GLS & nialmac, I thank you for that advise on alternatives. I have been thinking along those lines my self & the tediousness of the process has held me back for a bit while I exhaust all other avenues.
I do want to keep the lead off the barrel walls for a couple or three reasons, one is leading & the other is pellet distortion.
The gun is choked modified & modified & I don't really want to open up patterns any more.

The cases that I have are a motley looking mob & I will be separating them by make & colour for differing shot sizes.
All are modern straight wall ribbed cases & lead shot.

Winchester Au. Super X high brass. 2 3/4". Red.
Federal USA. Game Shok high brass. 2 3/4". Purple.
Eley GB. VIP high brass. 70mm. Blue.
CRC. Italy. RC16 low brass. 67mm. Green.

In the past I have loaded straight wall 12g cases with Win AAA wads made for compression formed AAA taper cases & nothing untoward happened.
Question. If I can only get the Remington wads for taper cases, can anyone foresee a problem using them in the straight wall cases that I have ?
O.M