I spoke with Dave and tried to get an understanding of what was going on.
Sometimes, not all the parts of a complete unit are wanted by the customer. For instance, not everyone uses a coal bin, so the long auger and worm can be eliminated, although, efm does not recommend this. Some don't need a domestic coil because they use an indirect heater. Some don't want the jacket because they use the emitted boiler heat to heat their basements. I don't know how anybody gets away without the timer in the summer. I don't like the idea of NOT using the supplied triple aquastat unless 2 L4006s are used. One for low and one for high limit safety. A rebuilt stoker may be OK depending upon what was replaced.
The advantage of Dave's type of approach is to suit the complete unit to the customer's needs and in this instance, have one available for immediate installation. If you would like a complete unit, there should be some available very soon.
I will post the list of items of a complete stoker, as supplied to our dealers by efm, on the efm forum as soon as I get some time.