I have looked at what is available on the UK market. I do know that their are some good models available in the US but when I have tried to purchase these, they either aren't posted to the UK or the postage is really high and makes them prohibitively expensive.
So this is a look at the guns that are easily available over here. I have had to rule out what look like some excellent looking field pieces on the Northstar 28mm 1866 range as they come with gunners and the guns are not sold separately. Call me mean but I don't want to spend £12 and throw away 4 gunners. I also ruled out the 20mm B&B FPW artillery as having bought some I considered them too small. They are shown as unpainted guns in the pictures below.
Basically, this left me with 28mm Foundry and Old Glory.
Franco
Prussian War Artillery - Prussian
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Make
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Type
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Length (inc Barrel)
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Wheel Diameter
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Width
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Barrel length
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Old Glory
GSG-002
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Krupp Gun
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57mm
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25mm
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30mm
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37mm
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Foundry
FPPG001
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Prussian Field Gun
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52mm
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22mm
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25mm
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30mm
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Foundry
FPPG002
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Prussian 90mm Krupp Field Gun
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65mm
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20mm
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38mm
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37mm
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The only gun capable of seating my 'Minifigs/S range conversion' is the 28mm Foundry Gun. The Old Glory gun would probably sit a 20mm gunner.
Just to prove a point 20mm and Old Glory 25mm side by side.
So these are the guns I settled on 2 Foundry guns and the Old Glory Krupp guns.
The real surprise is that the Foundry Prussian Field Gun has a longer gun carriage that the 90mm Krupp gun by comparison. I haven't bought the Prussian 21cm Foundry Krupp Mortar at £8 plus VAT and postage or the 15cm Krupp Siege Gun again at £8 plus VAT (although oddly this looks the closest to the style of the original S range flied piece.
I hope this is of some help.