What lenses to use in dome port?

I bought a Sea & Sea DX30/60.................... yes I know, it is old but this will be a perfect housing to take the first steps in underwater DSLR shooting. With this housing there was a flatport, a 8 inch domeport and a extension ring. For my Canon camera I have a 17-40mm f4 lens, my question is if I can use this lens in the domeport or is it designed for a other lens. How can give me some info on the lenses to use with this port.

According to the Sea&Sea system chart, the 17-40 only works with their fisheye dome port. Is this the one you have? Here is a link to the system chart:

http://www.seaandsea.jp/products/digital_s...mchart/007.html

According to the Sea&Sea system chart, the 17-40 only works with their fisheye dome port. Is this the one you have? Here is a link to the system chart:

 

http://www.seaandsea.jp/products/digital_s...mchart/007.html

Problem is that I don't know with nummer domeport I have got. If I go with the dimensions of the port it must be the fisheye domeport.So I can use the owned lens.

Thanks for the info.