Seller finance legal fees

[Thomas Corso]

I am finalizing a seller finance deal. 

The seller wants my side to pay for all legal fees such as drafting the mortgage and note. I stated I am more than willing to pay legal fees but i would like to pick the attorney to do so. Seller is asking I must use his attorney even though I am the party paying. 

What are others experiences when dealing with legal fees on seller finance deals. Do I have a right to use my attorney over theirs if I am paying ?