You can get the screw-in type of GND, but with those, you're stuck with having the graduation in the middle of the image. There is no moving it up or down. With the Cokin Z-Pro or LEE filter 4x6 system, you have a lot of vertical movements, so you can have the horizon anywhere you want. You need to buy a filter ring adapter and a holder too. This can cost quite a bit. The Cokins are cheaper, but not made very well. The LEE system is made very solidly, but the adapter, holder and a filter will set you back about $375 before taxes.
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2007 Volvo V50
Taken by ex: 2005 Toyota Prius.
R.I.P. 1997 Lexus ES300. 
R.I.P. 1989 Acura Legend Coupe LS.
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