Hi,
I damaged a track rod and track rod end earlier this year. You are right: there aren't any true FRP track rods around, however you can use the following:
From REMOCO Parts for Fords (0161 477 1415)
120441177518 Ford FOCUS steering rack bar 1998-04 TIE ROD track arm
It cost me £10.99 + £3.50 carr. = £14.49
I bought this through ebay: here is the link - if it works!
http://cgi.ebay.co.uk/ford-FOCUS-MK1-MK ... 5ad186b082 Good Luck!
Mike