GMT 400 body style

[68 50th]

Having a discussion with some people about which models changed to the new body style in 88 and which did not.
What I thought was that Blazer, Suburban and all C/K 30 or C/K 3500 kept the old body style until 91.

I looked in to it a little more and it seems like it was only the crew cab pickups that kept the old body style (and Blazer, Suburban) but all other pickup versions got the new body style. Maybe also the reg cab and chassis trucks kept the old body style to 91.

Some say certain plants outside US kept producing the old body style longer than the US plants.

I thought I should ask on a place where I know there are a lot knowledgeable people around.

Sorry if this has been discussed before, did some searches but couldn´t find an answer.

Thanks