G-48 and G-05 are interchangeable. G-48 has that 2-EHA.
AFAIK, MBs much older we’re specified with Glysantin G-05, I’d run that. While I do run coolants with 2-EHA (Dex in my Chevy truck, G-48 in my bmw), I’m not a fan of putting it elsewhere.
I do still run G-05 in my CI MB diesels. In my OM60x MB diesels I’m taking them all to JD Cool Gard II, primarily because the mixed metal engines tend to consume HGs, and Jd seems the best for mixed metal engines.
Ive also taken my Cummins diesels over to that product as well.
So another option if you can find it.
But otherwise I’d be patient and find g-05.