Expand your horizons and dont limit yourself.
Almost all companies from different industries can be your ECA Refferal.
What matters is how you customize and present SFI to every ECA in a way that enables them to see how they benefit.
Get also to do some research about the company, their goals, their target market, their product and their achievements.
These, coupled together with your efforts and SFI will be sure to work for you.
All the Best