Hi Cole,
Thank you for contacting Bitspower.
We have sent an email to you but no response.
Would you like to check your junk file?
You can use the OD16mm acrylic tube, such as the following one.
You can cut it to the correct size.
Or could you send us your shipping address and phone number?
If we have the spare tube, we will send you the quotation.
shopservice@bitspower.com.tw
inna@bitspowerusa.com
https://shop.bitspower.com/index.php?route=product/product&path=674_679_688&product_id=8328