In the old days, that's how the polarity was controlled. The receiver would output a pulse that controlled the position of the little antenna inside the feedhorn. These days, the standard is to use voltage to control polarity. LNBFs have 2 circuits: one for V and one for H. If the receiver sends 13 V the LNBF uses the Vertical part, and if the receiver sends 18V, the LNBF switches to the Horizontal circuit.
These old LNBs would work (the specs are not great but not too bad) but like Johnny said you'd need to find a way to control the servo (the blue thing). You could use an old analog receiver, or an ASC-1 positionner (discontinued), or build a controller.
Frankly, you'd be much better off getting a C-Band LNBF (Titanium PLL), and for Ku, I've had great results with simply attaching a cheap Ku LNBF to the side of the C-Band scaler. Stay away from combo C/Ku LNBF.
As mentioned above, to move the dish automatically you will need either a Titanium ASC1 (discontinued, you may be able to find one used on eBay, craigslist,etc) or a VBox mover. There were several models of the Vbox made (Vbox II, Vbox7, etc). There was an issue with quality control on some models of this box a while back. The only place in the US I know of that still sells a model is this site but they a currently out of stock until late September.
Just an FYI, I have never purchased from here. I have seen people say not to but I don't know if that is because of their products, more likely because they post feeds in the open (which then sometimes get taken down) plus I heard they are very strict about posts on their site. It is their site though and they can run it any way they choose. I guess it all comes down to 'I need it and they have it so'...
If you search for vbox positioner in your browser several European sites do come up with some. You may be able to contact them and acquire one there.
You could also find and old receiver on ebay that has the ability to move a dish. You would lose the ability to move automatically to a satellite when you select a channel and would have to manually move to your satellites but it would work.
There was also a project here about making a DIY dish mover with an Arduino. If you are handy you could try that.