Where do you finds Iron Golems?

That's all I need to finish my Collections, but I can't find it!

If I remember correctly, you can find them on the floor before Chaos.

I know that much, but where exactly is it easiest?

There is no easiest. The air floor in the ToF is the only place they exist. Fight 255 or so battles there in a row and I'm pretty sure you're guaranteed to find at lost one group of them if you play the NES version.

I found em near masamune but thats just me. I dont think it really matters though

it doesn't matter!
listen to Unne & praise him, the almighty FF1-expert!
hey mays know even more than I do (I'm sure he does);)

Indeed. Listen to Dr. Unne. Everyone knows him. What? You've never heard of Dr. Unne?