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Hi. I'm Steve. I'm sorry to hear about your TV. I will try my best to give you a precise and accurate answer.
It does appear that the base is not stocked anywhere. This is typically the case for most manufacturers and if you do manage to find one, it is usually an old ratty used one.
Here is an alternative mount that will fit your TV and at $40 its a bit of a bargain. I have one of these (the larger one) and it works great with a 42" LG which was on the wall so I threw the base away. Doh!
Anyway, let me know if I can help you further.