I have an older Clam Guide flip over.
I replaced the cover with a new insulated cover from Clam. (they also have non-insulated replacements)
They can help you find what cover would work best for your application. For the Guide, a Nanook replacement cover worked out great.
And what a huge difference the insulated cover makes vs. a non-insulated cover.
Here is my order information:
Order placed October 5th, 2018
Item - Nanook Thermal Replacement Tent
Sku 3646
Qty 1
Subtotal $229.99
Shipping & Handling $15.36
Grand Total $245.35
Good Luck All