Seller finance or escrow in SBA funded deals

I am looking for some stats on how many of SBA funded deals does have seller finance or escrow component in the deal structure ?

Trying to make a case with broker for 10% escrow for 12 months due to customer concentration, key employee retention and some reps and warranties. Broker says the 10% is not common.
I thought seller/;broker would be more receptive to escrow than financing.

Thanks in advance.
Amby