Metal chimney through metal roof, best option

[beefstew]

I'm about to start the install of a metal chimney, which will run out through a block basement wall and then up (~16ft?) the side of my house. Soffit is 16", and the Supervent (Selkirk?) instructions are ADAMANT about not using a pair of 15 or 30 deg offsets to go around the soffit. Instead, I'm supposed to go through the soffit. My house has a standard "ribbed" metal roof (Midwest Manufacturing via Menards).

So far as I can tell, there are two options. First option is the Selkirk Rubber Boot Flashing kit for metal roofs


2nd option (via the roof vendor) is a silicone boot (p 22 of, (broken link removed to http://www.midwestmanufacturing.com/MidwestManufacturing/web/docs/pdf/HelpfulHints.pdf)) and then a steel cover above the boot, along with a snow jack/plow above the chimney.

Has anyone tried one or both of these options? The selkirk kit seems pretty cock-a-mame, but it is vendor supplied.

 

[begreen]

Don't use that. Reports are they don't stand up. For a good permanent install use the ICC Excel metal roof flashing instead.
(broken link removed to http://www.icc-rsf.com/main.php?t=chem_produits&i=95&l=en)
This is what it should look like, before the storm collar has been put on:

 

[beefstew]

Don't use that. Reports are they don't stand up. For a good permanent install use the ICC Excel metal roof flashing instead.

Don't use which? Both? Also, I can't seem to find the ICC boot for sale. Could you suggest a vendor?

 

[begreen]

Don't use which? Both? Also, I can't seem to find the ICC boot for sale. Could you suggest a vendor?

Yes, the silicone boot is better, but the metal flashing is best. I just did a google search for ICC Excel flashing. This is the first site on the list.
(broken link removed to http://www.stoves-pipes.com/6-ICC-EXCEL-CLASS-A-CHIMNEY-PIPING-s/145.htm)