I'm looking for an inexpensive rigid fork to replace the kaput suspension fork on a '94 Specialized Hardrock mtb.

I see this ebay ad:
http://cgi.ebay.com/ws/eBayISAPI.dll...m=190383356523

Guy is really stingy with info. I sent email asking specific questions.

The main question I want to ask here is if there is anything unique about a "tandem fork" that would render it inappropriate for an mtb?

If it's just a regular fork that happens to have been on a tandem, then all I need to worry about is steerer diam (1 1/8) steerer length (>15cm) and threaded portion (top 5 of those 15)----add 1 spray can of black paint and I'm in business, right?

Also I guess I should have 4-5 cm of rake, right?