new front sprocket

[cosmo_bojinski@hotmail.com]

Hello All, I will be soon replacing the front sprocket on my A12.The new sprocket is definitely directional, it has a flat surface on one side while the other side has a small lip.Will it be obvious which way it goes on? It is an aftermarket item it also has two threaded holes which I assume would be for earlier model applications,should still fit on the A12? Really appreciate any info...cosmo