Is there a marketplace for co-signers?

[Jace Holt]

I am doing a project where equity investors do not have to sign a guarantee. However the bank financed portion will require one or multiple people to guarantee the loan with a net worth equal or greater than the loan amount. I am offering a fee for the guarantors. I patterned this structure after some other larger operators I've worked with. 

My question: Is there a market place or groups or directories of parties who offer guarantees?

I have used directories for hard money lenders and other service providers so I figured I would see if there is something for this.