If you have access to a 3D printer you could print the cartridge and make your own. 
The files and instructions are located on Thingaverse, search for teletype model 43.

Michael Enkelis
From: [email protected] <[email protected]> on behalf of Eric Moore <[email protected]>
Sent: Monday, November 3, 2025 5:43:02 PM
To: Nick England <[email protected]>
Cc: [email protected] <[email protected]>
Subject: Re: [GreenKeys] Hello Greenkeys! (And looking for an M43 KSR)
 
We had a 43 at our booth at VCFMW. It had holes blown in its ribbon,
someone did find a new one, but of course it was dry and print quality
was terrible.

I am seeing more and more interest in hard copy terminals. I imagine
some factory somewhere is still manufacturing pin head assemblies,
whoever makes a repro teletype or silent 700 or similar is gonna make
a tidy sum selling them on tindie and ebay.

-Eric

On Mon, Nov 3, 2025 at 10:31 AM Nick England via GreenKeys
<[email protected]> wrote:
>
> Evidently, even rarer are ribbons for M43/M42 - if anyone turns up a source, please let the list know...
>
> Nick England K4NYW
> Chapel Hill NC
> www.navy-radio.com
>
>
> On Mon, Nov 3, 2025 at 11:09 AM Harold Hallikainen via GreenKeys <[email protected]> wrote:
>>
>> Interesting that the 43 is now rare. I bought hundreds of them in the
>> 1980s. They were a very nice dot matrix impact printer. The type quality
>> was great.
>>
>> Good luck!
>>
>> Harold
>>
>>
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