Remington 1911 R1

I have a new Remington 1911 R1, and would like to find some "custom" grips for it to enhance the gun. What size grips do I need to focus on?

Esmeralda Grips (http://www.esmeralda.cc/)

http://www.brownscustomgrips.com/

He's a member of the forum, I think his name is Olympus. I got some spalted maple and some snakewood grips from him, and they look so good I almost dont want to shoot the gun now.

You are looking for Government/Commander or Full Size grips.

Officer/Compact is the other size. They will be too short for your pistol.

https://vzgrips.com/ Start here.

VZ grips are top notch. Costly, but hey, you're enhancing!:D

There are two main sizes, Government/Commander and Officer. Variations include Roundbutt, Bobtail, Square Bottom/Magwell Cut and Beveled (standard, what you currently have).

Both beveled or magwell will fit your Remington and generally the latter will cover the MSH takedown pin and will be flush-cut (flat bottom). Some prefer the look, some do not.

I have a new Remington 1911 R1, and would like to find some "custom" grips for it to enhance the gun. What size grips do I need to focus on?
Did you mean enhance the looks or the shooting?
Either way, grips are like gloves or dress shoes. Better handle them before you pay. Also, adding exotic wood or bone to a combat firearm could make it look garish and the owner vain.
For shooting, if your paws are at least midsize, one thing to consider is a wraparound weighted 1911 Pachmyer grip. You may find the balance shift helpful to your practical accuracy.

Or they could look nice and feel comfortable in hand and holster.

here is mine with cape buffalo horn grips

http://farm8.staticflickr.com/7244/7360669214_d215d8c7d8_z.jpg

http://farm8.staticflickr.com/7232/7360669508_798fd3b82c.jpg