SL springs in rear, need shortened shocks?

[sirchAU]

Hey guys,

I'm thinking about lowering just the rear of my S-pack AU to Super Low (50mm) ride height, from the factory Tickford suspension height (30mm), so basically another 20mm lower in the rear to make it even with the front. The rear sits quite high at the moment, noticeably higher than the front.

My question is, will I need to get some new shortened shocks as well, or will the shocks I have now be ok? Worried about negative camber angle wearing out the inside of my tyres prematurely. Will a camber kit be required?

What are some brands people here are using and/or recommend? Have a really limited budget, so the cheaper the better..

Was looking at these on ebay for $260:
Ford Falcon AU Live Axle Rear Shock & Spring Suspension Kit Super Low Height
They're King SL rear springs paired with Ultima Gas shocks. Are these shocks shortened? How do they compare with say, Monroe GT Sport shortened shocks which I notice a lot of people seem to have?

Also, quite like the look/height of the Eibach Pro spring kits that i've seen a few other members have on their cars, but a fair bit more expensive from what I've seen.

Anyway cheers for any help, I know sweet FA about most of this stuff but I'm learning all the time thanks to these forums.

Thanks,
Chris