SR8 (SR3) Pedalbox

[dunkel.ch]

Hi,
anyone changed or upgraded the default Radical pedalbox by a higher quality one?
I consider upgrading my one with one of these:

http://tiltonracing.com/product/600-series-3-pedal...
(with original master cylinders)

http://tiltonracing.com/product/800-series-3-pedal...
(will need other master cylinders)

I am not 100% sure it will fit and if it might be worth the money. Main reason for upgrade is that I propably need to rebuild my master cylinders and the original box feels a bit cheap.
Comments and suggestions welcome