Just FYI:
When rebuilding do not order the expensive kit that comes with all the new brass synchros (I think the price is usually $700-800). Just order the Carbon Kit from Synchrotech as it's cheaper and considered an "upgrade" vs the OEM part.
https://sync-trans.com/products/syn-nsg-c-nsg370-1-6-r-carbon-synchro-set
The kit doesn't come with the Steel "top plate" but I figured out that a new one isn't needed. Below you can see the comparison between a new one and one with roughly 120K miles, they look identical. The only reason I bought these because I thought mine "looked bad".
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Will be keeping the ones that came with the transmission and storing the new 3-4 Synchro kits.
Also, the 3-4 synchro kit retails for $150 (cheapest i've seen it) but that is because they use "NSG370" here in the USA. I've been purchasing a ton of parts from overseas and it comes out cheaper than buying them here. For example, I purchased two sets of the 3-4 synchros for a total of 80 euros shipped, that would have been over $300 here in the states.
Mercedes Part # 211 260 1545
When it comes to synchros and most internals anything that says Mercedes 711,712,716 is the same as an NSG370.