You can opt out of SD especially if one side if the packaging is longer than 120cm.
However, there is currently an issue that Simple Delivery not offering Custom Postage to oversize items, lightweight items and those under £10, these are all exempt from Simple Delivery.
There is a workaround.
From the link below Go To Solution and follow the advice in Rick's answer to list your item.
https://community.ebay.co.uk/t5/Seller-Central/how-do-you-list-anything-bigger-than-61cm/m-p/7882638...
You will need to update your tracking so when it shows delivery your payout will be released sooner.
- Go to "Orders Paid & Dispatched"
- Click on "View order details"
- Within the "Postage" section there's a small dropdown arrow next to "Track Package" - click on that.
- Click on the "Add tracking" option
- A box will come up with the current tracking number . Delete that and replace it with your tracking.
@touchofjade2024
@touchofjade2024