The answer is still the same.
Pull the bolts and find a shackle to match. That age of trailer has parts that are no longer in a book. And many of the parts are generic trailer parts not necessarily specific to Airstream. The issue is they are generic to really old trailers.
1966 Mercury Park Lane 4 DR Breezeway 410 4V, C-6, 2.80 - Streamless.
1966 Lincoln 4 door Convertible 462 4V 1971 Ford LTD Convertible 429 4V Phoenix ~ Yeah it's hot however it's a dry heat!