On a second bike I am building up I have the old black and gold mono minis 180mm on the front. I bought some of the Marzocchi MX Lo 100mm forks in the Wiggle sale but I can not figure out which adapter I need (bought 74mm Post to IS 183mm but that does not seem right)

Help me out please as I want to get this bike up and running asap. Cheers

Have you had a look through this?
http://www.hopetech.com/database/HOPE%20STEP%20UP%20MOUNTS.pdf

Had a look and I think I must need this one?

http://www.chainreactioncycles.com/Models.aspx?ModelID=13735

But it says not compatible with marzocchi 😕

It'll bolt up as it's 74mm, but you'll more than likely have rubbing problems, I did with some Marz forks I had, just had to do some creative work with a file!