savage 301t hammer extension

[Old Timer]

A bubby bought a 301t 20ga. He`s looking for a hammer extension. The Carlson and Uncle Mikes do not fit. Any advise? Thanks

[dhcrawford1]

I bought a Uncle Mike's that was a specific fit for a New England Fire Arms shotgun and it seemed the fit well. Is there another brand specifically made for the Savage 301?