How do I ask for an exchange when the replacement size is out of stock?

Keep the message factual and make the next step easy to answer. Include an order identifier, the item, the size you received, and the size you want. Then say what you found about availability and ask which options the seller’s current policy allows.

The FTC recommends collecting purchase documents, explaining the problem, and clearly stating the resolution you want, such as an exchange or store credit. That supports making a focused request, but it does not establish that an out-of-stock size can be exchanged. [S1]

A polite request can be direct: “Could you let me know what options are available?” You can name a preference, but leave room for the seller to explain its policy.

Include only details that help identify the purchase and decide what you are asking for:

1. Order number or another purchase reference.
2. Item name or description, plus the size you received.
3. The size you want, and that it appears unavailable.
4. Your preferred next step, if you have one.
5. A request for the options available under the seller’s current policy.

Have your purchase documents to hand when you write, as the FTC advises. [S1] Avoid guessing why the size is unavailable, claiming you are entitled to a particular option, or adding a long history that does not help identify the item. If you are unsure whether an exchange is available at all, ask rather than presenting it as settled.

Yes. State that as a preference, not as an assumption that a restock or reservation is possible. Then ask whether waiting is an option and, if not, what alternatives the seller can offer under its policy. This helps the seller respond to your actual preference without requiring you to accept a substitute.

For example, you might say: “My preference is to exchange for size [desired size], even if that means waiting, if your policy allows it. If that is not available, could you explain the other options?” You can remove the waiting phrase if you would rather resolve the exchange sooner.

Use this editable version. Replace the bracketed fields and delete any option that does not reflect what you want:

“Hello, I’m contacting you about order [order number] for [item name]. I received size [received size] and would like to exchange it for size [desired size], but that size appears to be out of stock. My preference is to wait for a restock if that is an option. If it is not, could you please explain what options are available under your current exchange policy? I can provide the purchase details if needed. Thank you.”

If waiting is not your preference, replace that sentence with your preferred alternative or simply ask what options are available. This wording requests information; it does not imply that a restock, exchange, or particular remedy is guaranteed.

Reply with one focused follow-up: acknowledge the stock answer, restate your preferred outcome, and ask what other options the policy allows. For instance: “Thanks for confirming. Since size [desired size] is unavailable, could you let me know whether waiting is possible or what other exchange options are available under your policy?”

If the answer still does not explain the options, you can ask the seller to clarify which policy applies to your purchase. Keep the message and purchase details together so you can refer to the same item and request.