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Just unbolt the seat from the floor and pull it out.
The custom had differen't trim on the sides of the car and the swinger was a sporty 2 dr. model with the swinger badges and could be had with a six cylinder all the way up to the 340 V8 and bumble bee stripes.
go to manheimgold.com and figure it out.
2 horns.
5*4.5
depending on which engine you got the base swinger with the slant 6 was around $2,800.
A few extra bells and whistles with the interior, hubcaps, & body trim , but no performace parts
.035
20,000
A base 2 dr. dart in 1966 was about $2,500.
Around 3100-3300 lbs
Depends on the engine and transmission