Questions about a permanent pier for MyT

Hi - I have a MyT that I would like to put on a permanent pier.  I currently have it on the portable pier but would like to increase stability.

Hopefully you can answer a few questions.

1) It look looks like I would need the MX Permanent Pier and the MYT Pier Adapter Plate.  

Is that correct?

Other than hardware to bolt it to the pad, is there anything else that I would need?

2) Can the extension tubes from the portable pier be used with the permanent pier?  Not a deal breaker, but I would potentially benefit from the extra height

3) Does the MyT just screw into the top of the pier (or plate, as the case may be), like it does with the portable pier?

Thanks!