Anyone know where I might be able to find a set of A12A conrods?

In any late 70s 120Y (B210)...Any Sunny B310.

All of the newer A12s, were A12As as far as I know. If the dizzy is in the middle of the block, then it's a A12A.

Isn't this right?

I think that you will find that the A12A came out in very limited numbers and most of them when to the US. Ask Chris, as he has been finding some.

The A12 designation was applied to ALL of the A series engines that used a bore of 73mm & a stroke of 70mm, regardless of where the distributor was mounted.
The A12a was basicly a late type A12, but with a bore size of 75mm. This pushed the displacement out from 1171cc to a whopping 1237cc.
This capacity was neither fish nor fowl when it came to tying it to an even multiple of 100, like all the other A series, but it was still closer to 1200 than any other size, so it was refered to as the A12a

The pistons in these engines used the same larger diameter wrist pins that are used in the 76mm pistons that are found in A14 & A15 engines.
The Rods in A12a engines are the same length as regular A12 models, but have the larger little-end eye to accomodate the larger pin. This makes them ideal for A12 engines that are bored out to use the A14 pistons with stock cranks, or A15 pistons when using A14 cranks.

The A12a was used as the standard engine in many B310 models that were sold in some overseas markets, including Japan, but they were not sold here in Australia.
They seem to have not been too popular in the US & it looks like most buyers opted for the optional A14 engine, The upshot of this is that these con-rods are not easy to find.

Hmmm, found some 73.5mm flat tops in an obscure place in the ACL catalogue (not listed under the "pistons by size" section either). Only thing is they have close to 20.5mm pin dia.
So now I have a set in the garage.
The standard A12 rods will do the job, but because this is a race engine it would be nice to get the A12A rods with the larger small end dia to for a little extra insurance.

Oh yeah, I also have 3 brand new, original Nissan 1.5mm OS A10 flat top pistons if anyone is looking. They could be yours for the right price.

The factory A10 piston was 73mm in diameter, had a nice flat top, & a longish skirt. As pistons go, they were a good design.

The 1200 piston was derived from the A10 piston with two important diferences.
1. The crown was dished to bring comperssion under control now that it had an extra 11mm of stroke [from 59 to 70mm]
2. They shortened the skirt. With the extra stroke, the piston was drawn down far enough to conflict with the crank. No problem, just shorten the skirt a little & everything was fine. This too is a good design.

This longer skirt in the A10 piston is where the problem emerges if one tries to use A10 pistons in an A12 engine.

ENTER REPCO
When Repco made replacement pistons for these engines they saved some drama by basing both pistons on the shorter A12 piston blank. For A12's they machined in the dish, & for A10's, they machined them flat.

So if one is after flat top pistons for A12's in the basic 73mm size [including OS] then have a look at "replacement" A10 pistons.

Getting replacement pistons for the A10 is good in theory, however in practise ACL have not made them in years.
The only way you can get new ones is to have them made as a custom piston, at about $300 each this is not a real cheap exercise.
Dodgeman, if you know of anywhere to source these pistons for less than $100 each it would be appreciated if you shared the knowledge a little.