What, where or how do I get an intlet manifold for

GSXR750 Carbs onto a Zetec 1.8?

I plan on fitting GSXR throttle bodies to a 2.0 Zetec, and as far as I know you need to get a custom manifold built, 'm gonna get altiss engineering to do mine, not the cheapest, but the finished article looks superb. I think Bogg Bros also can manufacture you one, google them both and that should give you somewhere to start.
Regards
Matt

Could try here.

http://www.robocog.dyndns.org/knnmanifolds/index.php3

I saw some on ebay last night.
In the kit car section.
One for a pinto and one for a Zetec £100 each Buy it now price.

I'll add a link later if I can find it again.

http://www.locostbuilders.co.uk/viewthread.php?tid=58111

Here is theLink

If using GSXR carbs I would try to respace the carbs to keep the intakes straight rather than use some of the very angular manifolds that I have seen.

As the inlet ports rise progressively from the throats on a Zetec it is also worthwhile having the manifold tubes angled upwards from the flange to get the carbs setting at the correct angle without resorting to steep upward bends or turns in the manifold tubes.

Well that's what I have done for my Zetec with GSXR TB's.