Stephen,
If you used this Extender-Q x1.6 on your Sky90, its will be the Tak part number: TKA00595. This Extender-Q (TKA00595) can also be used with the FSQ-106N.
The new FSQ-106ED uses a new Extender-QE - Tak part number: TKA36595. This not compatible with the original FSQ-106N.
This is easily verifiable through the Tak system charts.
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