I have a Microway flicker fixer for sale (NTSC Version) which includes the optional gen-lock module. The FF also comes with instructions for installing the module along with V1.1 software for the FF.
Please PM me with an offer, I have tested this and it works great in a 2000 or 2500 computer. I did not test the gen-lock module as I don't have an external gen-lock to test it nor did I test the software on the disk since I didn't need it for the FF to work.
The output on the FF is 9pin so to hook it to a current 15pin SVGA monitor you will need to get an adapter which can be found on Ebay. I think the 9pin end on the needed adapter is male and the 15pin is female.
Here is a
LINK the FF I have does include the mounting bracket.