2008 Tundra 5.7 Rad support bolts

So I changed out my radiator yesterday and in the process of trying to get the bottom left support bolt back in, it fell off the socket and is nowhere to be found even with 3 different magnets. I gave up looking for it and am now trying to find a new one to purchase to replace it but cannot for the life of me find anywhere that sells them that fit this truck nor can I find information anywhere as to what the size of the bolt and washer is. Does anyone know the size or possibly where I can find this part?

 

It probably slid just out of view. I used a pencil a small mirror and a hook needle to fish it out. If you've driven it, its 50/50 that its still there.