The Pro 34 blanket should fit, you run the straps through the hook holes on the back (top rack storage hooks). At least that’s how it works for the 575 and the Pro 22 blanket.
edit:
It sounds like the front hooks may be an issue:
Is there a blanket for the 780 or will the Pro 34 fit?
www.traegerforum.com
Try this one?
Amazon.com : BBQ Butler Insulation Blanket For Traeger 34 Series Grills - Fits Traeger Pro 780 - Compare To Traeger Insulation Blanket 34 Series - Pellet Smoker/Pellet Grill Accessories - Thermal Insulated Blanket : Garden & Outdoor
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