Mossberg 500; Extractor Replacement

[Deplorable Me]

I have a 20 year old Mossberg 500 that requires an extractor (L+R) replacement, does anyone know if the manufacturer made any design changes to the model that would warrant an older extractor model vs a newer extractor model?

(FWIW maybe 10,000 rounds through this particular shotgun.)

 

[Acer-m14]

I have a Moss 500AT ( stamped on the gun ) i can't find anything on it , to break this gun down you have to unscrew the mag tube to get it apart
all of the vids ive seen on 500's show you dont . my dad had this moss for yrs and i had it in the corner for 20 yrs it kicked like a mule i hated it.
finally got back into the gun game time to fix this mule .. now i love it .. my moss has a fixed spring on the mag tube welded on one end .. so the tube has to be removed to get it all apart .. from what ive seen in vids every thing else looks the same .. but all i can say is try calling moss on the phone and ask ..