Replacement armrest seat for 520

[Randy Lindblad 71]

Any recommendations for a direct seat replacement and link to the model number thank you 

[Lee1977 6,872]

The closest I have found is the Black Talon at Northern Tool. It won't fit with out removing the adjustable seat track drilling the two new holes in the seat spring.  You will need a good drill bit to drill spring steel. If your seat track is like mine It's useless anyway.

That seat has the 7 1/2" width by 7" mounting holes. The 520's have 7 1/2" by 8" mounting holes. Sorry, I don't think there is a direct replacement.