Well, I haven't found the original screws for my stand but did figure out by trial and error that they are metric M4 x 0.7mm. I am guessing that I need either a 12mm or 16mm length. Turns out that this quest was far easier than I anticipated.
I found a 6x32 machine screw in my screw can and it screwed in snugly but it was so short that it tightened in less than 1.5 turns so I could not tell if it was an exact fit or not, especially since the TV is still wall-mounted and I had to reach around to the back to access where the screws go. Took that screw with me to Home Depot and checked the closest size in metric because I figured that the original screws were most likely metric ones. Good guess on my part. The metric screws are the exact thread size but the 10mm length I bought screw all the way into the back of the tv without the extra thickness of the stand so I know I need longer ones. That will be another trip to nearby Home Depot but at least I know what size to look for. Two screws were right around .80 cents so 4 will be under $2 which is way better than $7+ buying 4 screws online!
I found a 6x32 machine screw in my screw can and it screwed in snugly but it was so short that it tightened in less than 1.5 turns so I could not tell if it was an exact fit or not, especially since the TV is still wall-mounted and I had to reach around to the back to access where the screws go. Took that screw with me to Home Depot and checked the closest size in metric because I figured that the original screws were most likely metric ones. Good guess on my part. The metric screws are the exact thread size but the 10mm length I bought screw all the way into the back of the tv without the extra thickness of the stand so I know I need longer ones. That will be another trip to nearby Home Depot but at least I know what size to look for. Two screws were right around .80 cents so 4 will be under $2 which is way better than $7+ buying 4 screws online!