The International Standard Cab was started around 1982 ran up to 2001 better known as removable or Non-Intergrated sleepers.
We refer to many of these openings as letters like “T” or “V”. International used a large rectangle opening for its class 7 trucks which we refer to as the rectangle. There were three different “T” models used by International. The first was the “Crawl-thru” used on the smallest sleepers. Next came the “Step-thru” which was used for the mid-sized sleepers. Last was the “Walk-thru” and this was used on the biggest sleepers of the era. Our Mega Cab kit works for these models.
International Mega Cab - $1975