LCT won't fit at all, I know this from personal experience. LCT uses a more realistic design and is modeled after the CA, VFC design. It's compatible with both of those. In order to use LCT gas blocks, you need an LCT gas tube.
Land Arms is the way to go in my opinion dude, again, based on personal experience. It is compatible with King Arms gas tube/rear sight block assemblies provided you get their gas tube with it. This little number is a perfect fit for what you're looking for.
http://www.ebairsoft.com/ak104-iron-...er-p-1290.html
It will mount on TM, SRC, King Arms, G&P and Kraken models no problem. The only issue will be the finish on the different metals. Land Arms uses a metal that mimics the finish of steel, where as King Arms does not. They use a smooth aluminum with a smooth matte finish.
Hope that helps.
And don't worry about Ebairsoft. I've dealt with them 5 times, and only once had an issue. They're under a different owner now who seems to know what he's doing.