A Request for Authorization to Substitute sample letter.
Our contract entered into on [date] specifies that we will deliver [specify goods].
We regret to inform you that the goods herein referred to are unavailable because [set forth reason].
We are hereby requesting your authorization to substitute the following product in lieu of the one we cannot obtain:__________. If you are agreeable to this, would you please acknowledge your acceptance by letter.
We will look forward to your response.