Since the wishbones are longer over stock, how much negative camber will it add?

Approximately .75° of negative camber.

I have installed this kit on my 2013 128i. Going forward, do you have a recommendation for how it should be aligned? (Using the 128i specs, the 1M specs, M3 or a custom setup)?

There is no major difference in alignment adjustments over stock. Negative camber will increase due to the longer wishbone and cannot be adjusted unless you have an adjustable camber plate. The toe angle will remain the same as a standard 128i.

Will this fit my 2008 328i Convertible (E93)?

Yes, this fits all 2008 328i models (E90/E91/E92/E93).

I read that you have to fabricate brackets for the headlight sensors on the rear camber arms on an E93. Is this true or is there an OEM M3 part I can use?

The rear level sensor is connected to the roll over strut (the arm with the spring pocket) on the inboard side and not the control arms you will be replacing. There is no special modification or part swap that is required to install the rear arms. The only time you would need to make a modification is if you are installing the M3 specific roll over strut arm (if installing a complete M3 style rear suspension) in which then there is a different bracket that can be used.

Will this fit my 2007 328xi? Are there other parts needed to fit or is there a kit like this for my car.

No. The front control arms in this kit only fit rear wheel drive cars as the front suspension on xDrive vehicles is completely different. Only the rear control arms in this kit will fit your vehicle but without the fronts installed there isn't much to be had by installing the rears only.

Will this fit my car which is a right hand drive BMW 2007 335i msport e90 Cheers Gary

Yes. Control arms are the same between left hand drive and right hand drive vehicles.

I have a 2007 335i W/ the sport package. Would these still fit if it isn't a base model package?

This will fit all 2007 335i models

Do I need to purchase the "install kit" for the front and rear control arm upgrade listed elsewhere on the website?

It is highly recommended to replace the hardware when installing new control arms.

this kit says it fits my 2006 330i but when I click on one of the individual parts it says "does not fit your 2006 bmw 330i"

Yes, this is an upgrade kit that uses M3 specific components. The specific parts on their own are interchangeable on non M models but other parts which are included in the kit are required for the conversion such as the front level sensor and retaining brackets on the rear control arms. Individual parts on our website list their specific fitment per BMW, retrofit kits such as this have applications that are specific for the conversion itself.

Would I need new bushings for this upgrade ?

No additional parts are required. Each control already includes the required bushings/joints pre-installed on eaxh arm as pictured.