okay what year might my truck's cab be? things not adding up!

[yellow400ex05]

Alright I have a 1986 Chevy K10, but theres some things that tell me the cab might not be an 86. I have shoulder belts, a dash mounted wiper switch and a floor mounted dimmer switch.

now if it was an 1986 truck it would be the wiper switch on the column, dimmer switch as well right?

the VIN is on the dash by the windsheild

i don't know if it makes a difference but i have a factory cruise control stalk on the column though.