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The number 3.6842-1003.4 should be their part number.
The 911 originally used a 7" booster and a turbo used an 8" booster. I think the 911 may have gotten the larger booster in 1984 or 1985.
You can search through PET and compare parts numbers for the various years or look for a compatible booster based on the Ate number.
The one on my shelf is an 8" booster from one of my turbos with the part number 3.6842-1001.4. I checked the Ate web site and they don't appear to show the boosters any more.
I can't recall which turbo this booster came from. I recall changing it on one of my cars to change the amount of assist to make it similar to the other one. Years ago, can't remember the details.
One thing you might consider, since you are new to the car, is whether it's operating normally or not. I'd have someone familiar with these cars drive it, as it will have a higher pedal effort than a normal car. Brake pads can have an effect on pedal effort as well, especialy when they are cold. I'd be curious if the car were running stock pads or aftermarket pads.
JR
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