Question for CS owners

So I have tried to find out but can not find a for sure answer. I have the CS with the smaller front sight. I installed a DPP direct and now want the correct front sight to co-witness. But I can not figure out the size I need. I called Dawson and guy gave me some numbers to use either or but then when I went to website those sizes didn't exist. So if anyone knows this answer or even a link to the one would be awesome. Or if you ha e one that you swapped out for a different one and looking to sale please let me know. Also thanks for any and all help.