I have a Jetovator only; with a Place diverter floor mount lever and a 43c X 180" cable.
Or a F type (gimbal type) Berkeley thrust adjuster that has been ground a little to get more lift. Don't know if it is a 12jc to I or a 12je to f adaptor or if there is a diference.
I think either one might be made to fit a C bowl.
I'm sure you would need a little help and parts from someone who knows.
Pictures if interested. The jetovator has been blasted and painted, the gimbal is a rough "pull"
$250 for either with cable and PD lever.
Sorry if this is spam, but he asked.