Perazzi MX8 clarification

Perazzi enthusiasts….
Looking for some insight/clarification.
I have a combo p-gun of 35,### serial era (Type 3). Single barrel is a top single. Each barrel has its own iron & forearm (latch cutouts are different). It has 3 barrels (two top singles - a 32” & 34”) & both use sale forend.

Questions:
Was this a normal combo set up (wood for each barrel)?
Finding wood is a challenge BUT finding wood that matches the single barrel is much harder. All of the o/u forearms I’ve seen, the latch opening is totally cut out. On the single barrel, the bottom has a hole, then a section of wood, then the rest of the latch hole cut out.

Any insight/clarification would be helpful.

Kurt