Which 8" Dome Port for Tokina 10-17???

I am looking to purchase an 8" dome port to use with the Tokina 10-17 on an Ikelite housing.

Which of the following would you recommend I purchase:

Ikelite Modular 8" dome port with 3.5" lens extension kit

or the

Ikelite Modular 8" dome port with 4.13" lens extension kit

Thank you in advance!

AMW

Check the port Finder at Ikelites website.

ikelite recommends the5510.11 port look here http://www.ikelite.com/accessories/ports/finder.html