Are the chassis all the same for classic beetles or do they change with different models?

Get John Muirs -"How to keep your Volkswagen alive, A manual for the Compleat Idiot" and Bentleys "workshop manual". They have a huge amount of info, John Muir is a "real world" work-book and the Bently Manual is the VW "Official Workshop Manual" . The Standard Beetle chassis's are pretty much all the same as far as basics. You can put an early Beetle body on a Later Beetle chassis and just have a few minor changes to make as far as i can tell. They did change the suspensions so the early 60's are slightly different then the late 60's as is the early 70's. You have to know what year the body is AND what year the chassis is as each year they made minor and or major changes form one to the other. There are major changes from the standard Beetle to the Super Beetles. You couldn't put a standard Beetle body on a Super chassis. The Super Beetles are slightly longer and have a Mcpherson strut suspension so they are pretty much identical Super to Super and from one year to the next as far as the chassis. Be aware tho that every few years VW made minor changes to the mounting of the suspension parts, seat mounts and other stuff. As far as Type 1,2 ,3 or 4 the Chassis are different but they all share similar items such as you can put the larger rear drums or front disk brakes from certain years Karman Ghia on certain year Beetles,etc....