This may be one of the last in the world. NLA. Has not been available for some time now. Found in a box in a dark room...
Hard to believe we still had one. Kent found it hidden away in the shop the other day. No long pin included. You will have to use that from your existing modulator. This red top unit came on my V8 engines during the 1980s.
1981 to 1991 722.3 Transmission RED Top Modulator - NOS
$196.00
SKU:
VAC-REDTOPMODULATOR 
Product Details
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$98.00
123 126 124 Chassis with 722.4x Transmission - Upgraded BLACK Modulator Valve
Fits late 1985 123 and other models listed in description from 1986 to 1993 - Check the color match
If you are experiencing very hard or less than perfect shifts, a failed transmission modulator could be the problem. New Genuine Mercedes part. This unit is an upgrade over the original. It has a better thrust pin design which is less prone to cause pressure variations in cold weather.