Hiya!
They certainly are Manitou Pro-C's - I ride these on my Marin and have done over 10,000 miles on them!
The circlip is a bit of a pain to adjust the fork as one side has siezed!
Let me know i you get stuck as I have the original manual if you want scans etc.
Ziggy - how do you find the coils and which ones do you use?! Mine have got the stock elastomer/ mini coils combo.