Technical High torque starter

I'm looking at fitting a High Torque reduced gear mini starter to my 58 364 Nailhead. After some gooogling, i noticed quite a few recomendations for the Powermaster units. I can only seem to find the Powermaster 9501xs ones for sale on various sites, including JEGS and Speedway motors, which seem to be a good price and with shipping to the U.K that isnt crazy prices, thing is they are listed as being for 64-66 401/425 neailheads. Can anybody tell me if this would also fit the 57-60 364/401?

A company called Snap Rebuilders also do the mini reduced gear nailhead starters for the 364, that again look to be decent quality at a good price, and with afordable shipping to the U.K . has anybody used theirs?

 

Best I can do, https://www.teambuick.com/reference/nailhead_part_interchange.php

 

Aah cool. Thanks for this. Looks like the starters interchange between the 3