Cheers Johnny.
The kit i have on my MK4 Astra is OEM parts, i made the kit up myself by buying all the parts seperate.
The kit consists of the following
(GM) carriers
(GM) Gsi turbo pads and then i got (Saab) 93 grooved dics.
The whole lot came just under £210 inc vat a year and a bit ago.
I am not sure of the difference of the Vec B & Astra sure some one else will know.
I wish i had saved all the part numbers from the boxes but i just chucked them as you do.
All i can say is they increased stopping power no end. And they look pritty good too.
I have been running them since April 06 and have done 20K on them and they are wearing very well.
Will deff replace them with the same again when i need too. Hope this helps. if you want me to try and dig out the reciecpt i can see if the part numbers are on that for you.