Best seat swivel base

Ok what’s the best base for the passenger seat to make it swivel I don’t have stranded seats or runners if that make a difference what are people using ?

 

Did you ever find anything? I'm researching for a winter project.

 

Westfalia ones are the best

 

I've an aftermarket one that's heavy duty and solid, I expect the Westy ones are marginally easier to fit.

 

I used one of these in mine.

https://www.ebay.co.uk/i/1223387182...BNNxwqajAU_zcycobqD-4wklVc4KzRhkaAmM7EALw_wcB

Works well