To answer your questions.

There are only three available, all others have been eliminated more than fifteen years ago.

As you may have gathered from my other post on this topic:
* It is a waste of time/money to use offset keys.
* A key does not correct over all timing, at best it is a partial bandage.
* The hours required to check chain elongation = you could have already rolled in a new timing chain = pulled all components back into timing alignment.

.

__________________
ASE Master Mechanic

Prototype R&D/testing:
Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician.
Noise Vibration and Harshness (NVH).
Dynamometer.
Heat exchanger durability.
HV-A/C Climate Control.
Vehicle build.
Fleet Durability
Technical Quality Auditor.
Automotive Technical Writer

1985 300SD
1983 300D

https://www.boldegoist.com/