Early urq diff lock switch?

[ejfluhr@austin.ibm.com (Fluhr)]

My urq has the single-pull switch that locks both the center and rear
differential in one shot.  I seem to recall that later models (or
perhaps '84 4000 quattros) had a double-detent switch that would
allow the driver to lock the center differential first, followed
by the rear diff.

Does this alternate switch exist, and is it a direct swap in for
my single-pull switch?  What car can I pull the double-detent
switch from (assuming it does exist)?

Thanks,
Eric
'85 CGT, '82 urq
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Eric J. Fluhr                                Email:  ejfluhr@austin.ibm.com
630FP Logic/Circuit Design                   Phone:  (512) 838-7589
IBM Server Group                             Austin, TX