I can offer this advise on this particular stock, if you can get it at a discounted price for the workmanship.
If all you are looking for is functionality, ...and not authenticity, the errors in inletting this particular stock appear to be that the holes for the mounting screws were drilled too close to the end of the stock. The stock holes could be filled with Brownell's Acraglass bedding material and then re-drilled in the proper location to remove the unsightly gaps around the stock iron. The width of the inletting appears to be good, only the hole locations appear to be in the wrong location.
It will never be perfect, but it will still meet the ATF description of an Artillery stock and look CLOSER to what an original stock should look like.
Inletting quality control as seen on this stock would never have passed German military acceptance standards... or even commercial standards for that matter. Peasant middle eastern manufacturing standards maybe...