sorry to disappoint, but i have a spare 22270-28020.
however, i have done some mucking around with these, and i think many have the same body with a variety of pipe configurations. i have found that the stepper motors can be swapped from one part to another as long as the body is the same (no guarantees!). there are two main body types - one with four mounting bolts (like yours?), and one with three.
not sure if this would be suitable for you...
i purchased one from this seller without problems... took a while to get here though! (but is relatively inexpensive).
best of luck, chris