Hello, just came across this thread.
I did my intensive research in early 2025 after the OSTRO VAM thread and some lead i found on the internet (reddit/youtube) for some SL8 frames.
My status after communicating with different sellers, comparing weights and carbon lay-up was:
Nicole Bike Store: Tyre compliance off - No-Go
Eisen Peter: Weight good but carbon lay-up and feedback on questions not convincing
First Class Carbon (Mirror RK & Polar): User issues and feedback on questions not convincing
Apextorm: Good communication, frame compliance OK, Weight only very sligthly off original, very neat carbon lay-up, even came with full serial number that was working at the dealer, is on the higher price side but supposedly quality is top (official dealer put the bike together and just worked before my bike on a full service on a original SL8 and did say everything went smooth without problem).
As I am currently searching for a Gravel Frame I re-joined all threads but currently I did not find any new accessible sellers that offer better quality but I have not finalized my reasearch yet.