Here is a setup how to directly wire two lavaliers into your camera it doesn't even matter if you lavalier micrphones are either mono or stereo. Just make sure you got enough wire for you to move your camera around or that is enough wires so people can sit comfortably without jerking the mics or cables. But also you can use the same setup for wireless lavaliers.
The cables needed are:
2x 3.5mm Female Jack to RCA Male
3.5mm Male Jack to RCA Female
Here below are link to the cables on amazon if you want to order them.