I have tried to push down the plate and what i can see itīs not bending anything, so yes itīs enough with material to hold down the block. And i will use the GTZ backplate. Have remove about 2-3mm on each side.
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Well I ordered the GTZ mounting kit (including backplate) and ordered the EK backplate. I think the EK backplate has a bigger mounting surface and therefore can distribute mounting pressure more evenly. I hope it will work and fit nicely. But I almost think it will because the holes for bolting should be lined up de same.
Here is a pics with the backplate to. Fits perfect :)
http://img99.imageshack.us/img99/5906/img1435ii5.th.jpg
Alright, sweet!!!!
If I received my parts and modified them I will tell you if the GTZ bracket will fit the EK backplate.