As it says in the title. These things appear to be difficult to find.

New is good. Info on where to buy a new pair is also good.

Used is okay.

I'll have a look in my shed tonight and see what's left over from moving stuff.

KG Trimning have quite a good carb parts range, that's where I got all the parts for my 175CD rebuild.

https://www.kgtrimning.org/carb-parts

https://www.kgtrimning.org/amazonp1800-1/engine-parts/air-filter/ml888k.html

Local outfit has some https://classiccarpartsaustralia.com.au/s.u-carburettor-stromberg-175-phenolic-block-to-suit-hd6-hs6-su-carburettors.-112866.

But I know in 240s with the CD175 the spacer has an extra hole for the idle bypass air, I bought one of those spacers not too long ago, just failing to remember where I got it...

Edit: VP Autoparts also have a great range of carb spares, they sell the same spacer that KG sells.

    jamesinc Thanks - I tried that classicpartsaustralia site and they send me 2 spacers which aren't for 1.75 inch carbs, the ones I got were for 1.5 inch carbs. 🙁

    Hopefully @Roinik might have a couple, if not, could be KG Trimning time.

    I bought one from GCP a few years ago for the turbo carby build. The hole in the middle was the key. I have a few others somewhere though they do not work. I think it was $20. i spent hours and days looking for one and never thought of genuine. Then there it was.

      dmc As you know, with a B20B, the manifold is THE Manifold - as in, one piece intake and exhaust - so, lots of heat soak from the exhaust underside part is already present. I'm hoping to minimise this with the 144's new engine.

      I have one from my box of bits here. I also found some other parts I'd misplaced. Unfortunately the remainder of the parts are elsewhere.