Alienware M17xR4 replace 7970m with 680m

Edit: Now trying to figure out how a MSI 4gb (maybe) model got into a MSI 2gb model for an Alienware M17xR4 as also a 2gb and how to deal with installing and how to determine 4gb vs 2gb as no software seems to report correct number and the model per techpowerup vga database shows the board matches the 4gb not 2gb model.

While I work on the issue with Dell, I have decided to get a 680m as the replacement. Simply due to it was designed for the Dell/alienware model, bios is happy with it and so no special modifications/drivers needed to get it working. I was going to go with 770/780m or 970m/980m but with OS limitations and bios versions hacked vs unhacked, 680m was best choice.

Now the first question, I have been told yes and no on this. The company who sold me this, compeve, stated the heatsink piece that currently is used on my now dead 7970m (had a 660m in system, they upgraded it to 7970m) would work on my 680m, however I have read in some places they will not work. I have the x bracket for the Nvidia (came with video card) and I know the x brackets are different, so that problem is solved. However whether my heatsink and the pipes are going to work with the 680m.
AT0MK0010F0 DP/N:00MMPT CN-00MMPT-72744-235-005Y-A00 current model

which is a 3 copper heat pipe design. I also noticed that the screws can be moved as if they planned this to support more than 1 type of gpu. However the copper part of the plate sits at a different angle (picture diamond vs square) like a diamond matching the 7970m chip and the nvidia 680m is more square in that part of the GPU would not have contact with the copper plate. However it looks like if I take a fine pointed knife, I can remove the spaces of the diamond to make it a square as the copper plates seems to be just covered with a black piece of tape like.
Would that be unwise? If good idea what type of tool to remove the parts of the black tape so the copper plate covers the nvidia.

Also came with Shin-Etsu MicroSi Thermal Paste. I have Formula 5 from Antec (but it doesn't mention if it can be used GPU's just says CPU - still in original package from 4 years ago). Now I have no intention to overclock the 680m and I don't overclock the CPU or any other parts.

Also are the little screws on the heatsink fine to use. The one they shipped in terms of the x-bracket only had 4 raised spots for where the screws go in.

so

1) Is the heatsink with pipes going to work fine with the 680m or do I need to purchase a totally different model
2) Is the thermal paste they included fine or even under normal use will it be unable to keep the temp low on the GPU (normal for temp)
3) Can the Antec Formula 5 a better choice to use than the included thermal paste or are both useless to keep the 680m under normal temps and high end games

Thanks any help is greatly appreciated.

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Alienware M17xR4 replace 7970m with 680m