tvrcarparts do the sun visor bracket..... but I think you are right, they are a TVR job.... might be worth seeing if you can find one at a breakers or maybe source the closest thing to it from Ford, Vauxhall etc ??
Hang on a sec - when did you defect to the dark side?
The missus and I decided that running two TVRs was silly... so the Chimaera was sold (I used it as a daily driver) and I bought something more sensible for the mileage I do.