now that these guys got that point accross...
the Spanish gun industry was of "cottage business" structure... so... many little guys each making their own guns start to finish... so there was no parts standardization... so even if you have one of the best of the Spanish guns, & even if you found a parts gun, from the same maker, it's likely there would require ( at best ) a large amount of fitting work, if the part "could" even interchange... ordering parts from Numeric's for example ( BTW... they may have a part "similar" to what you are looking for ) is difficult, as you almost have to have the part in hand to compare to the original to see if it would work at all... another option would be Gun Broker looking for a "parts gun" however you may need to buy 3-4 to find a part that would be similar enough to be able to fit it...
that doesn't mean that if the gun was passed down in the family & or you were retired & liked to work on mechanical things, had the patience & tools, that it isn't a worth while project to keep from getting bored... but you'd have to look at it like doing crossword puzzles or similar... the gun would be worth next to nothing, as far as resale, when repaired, & you could invest a large amount of time...
... by the time the HE models were being copied, there were fewer "cottages" making them, & fewer imported... so if the gun has family history, it may be "possible" to repair it
unfortunately as the knowledgable previous posters have eluded to... these are most often best used as shadow box art... some of the earier guns were so poorly constructed, that they broke upon intial firing when new... some had barrel bores that were too tight for standard ammo, & raised pressures higher than they could handle... others had barrels so loose, that no accuracy was possible...
I personally find them interesting, but gave up on collecting them, as I require all my collection pieces to be shootable, if I should want to...