well, vauxhall is the same as opel, no? the dimensions u mention are that of the supposed big momma, the titan has xactly the same width, and thickness, just a lil' longer.
a bud who modded his titan to the pic below told me u can get it done at any plumber. it is supposed to be tricky because heating the barbs too much, can cause the mini reservoirs to loosen from the actual fins (soldered together), so beware.
i have measured the fin area, u have to add dimensions from the reservoirs and barbs yourself
big momma = 160mm * 170mm
titan = 160mm*245mm
barbs on both rads are 15mm OD
btw the barbs on the titan i got are xactly the same as my buds that came from a different opel model. even got the same dent in it. if u wanna compare, go here
hope it works without registering)
http://www.overclocking.be/forum/sho...1&pagenumber=3