Factory Remington

Where can I find a shot shell carrier that will fit my Remington 870 factory top folding stock?
I have an Remington 870 with a factory top folding stock, my question is where can I find a shot shell carrier that will fit on top of the factory folding stock. I have seen the ATI universal shot shell carrier that fits on their own version of their folding stock, will this work on mine as well or do I need to drill some holes onto my factory stock?
I would contact Remington and ask for their recommendations.
TEL: 1-800-243-9700
I would also contact ATI (800) 925-2522)and ask if it is a direct fit or if modifications are required.
Most of the big companies are more than willing to give advice.
GA 3.05 – Remington Arms Factory