Adam the 60mm TB is from a 2.3 duratec engine and is generic to the 2.3 engines there isn't a specially made one im aware from ford for the ST it's the S-max throttle body that fits which is identical but noticeably different from the larger bore.

i currently have one fitted to my ST now, i paid £60 through garage discounts only because i managed to grab mine before the 'gold rush' to buy them and now Ford have ramped up the prices.

i would recommend one but not unless your are going further then a K&N filter and intend on cams, exhaust and mapping. This is something I'd get last considering the price.