Pool ladder install - extension socket wrench, what size?

[maintainpool]

To install the pool ladder and railing there is a long extension socket wrench needed, does anybody know what size this is and where to buy one?

 

[Texas Splash]

To install the pool ladder and railing there is a long extension socket wrench needed, does anybody know what size this is and where to buy one?

Did you ever find the correct size to assemble your ladder?