If it's been taken apart, inspected, put back together with new o-rings and case half gaskets, a Popsicle stick would be about $650 and a u-channel would be about $550. If it hasn't been gone through, half that value.
First picture shows a U-channel design, second is a Popsicle stick. The Popsicle stick transmissions have physical pivot points for the sticks, instead of just riding on the casing like the U-channels do. Then, there's a few other differences, as far as I know, the Popsicle stick versions have additional support for the input shaft and double o-rings on the plungers.
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