A Lyman 66LA will work also.
http://www.lymanproducts.com/lyman/sights/66-receiver-peep.php

If you want simalar vintage to your rifle, the Lyman 56LA was made for the 336 Marlin till the late '50s when the 66 was introduced

Charter Member
Ancient order of the 1895 Winchester

"It's an insecure and petite man who demands all others like what he likes and dislike what he dislikes."
szihn