The 95000 Series Ascent operator(also known as the Benchmark I) is an obsolete operator that was made by Dor-O-Matic who is now out of business. Only the arms from a Benchmark III operator will work on the obsolete Ascent (BMK I) operator, but no other parts are available for it. The control box and gearbox connectors are different. To replace an control or gearbox, the "COMPLETE" unit must be replaced with the current 9100 Series Benchmark III operator.
The 99000 Series Benchmark operator is an older (obsolete) Benchmark II version of the current 9100 Series Benchmark III operator. It has the same gear box as current Benchmark III, but different control box. The (obsolete) BMK II had 2 control boxes, a "STANDARD" and a "PREMIUM" version. The current BMK III control box (PREMIUM only) is a direct replacement for the BMK II control boxes.
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