The VIN # will prove its a K5,they have a different code for the Blazers than Pickups or Suburbans...
When my '69 GTO got hit 3 times in different accidents (rear ended twice,and a tractor trailer tire & brake drum came off on the highway when I was behind it and it wiped the passenger side out)--the insurance companies all tried low-balling me saying "we're sorry about the loss of your '69 Pontiac--and they offered $500 for it!..
I called the company up and told them "you left off three important letters -G-T-O !...book value on the car then,was well over 5,000 dollars...maybe a '69 Bonneville would be a $500 car,but not a GTO..
They kept jerking me around for months,and raised the settlement each time slightly...finally I told them "I'll have my lawyer contact you--I have had pain in my back since the accident,and un-paid medical bills" (I didn't have a lawyer--yet!).....3 days later they called me back and offered $2,000 for the car (and I keep it)--plus pay all my hospital bills..I accepted that offer,the car was nice,but not "mint"...(wish I'd kept it now too)..