difference between mk1 / mk2 exhaust heat sheilds

[rossbart]

Can anyone tell me what the dimensions of the mufflers are (diameter & length). I know that the inlet and outlets are supposed to be about 1.5" but I want to add some to my carrier that are as close to original as possible but I don't know what dimensions to look for. If someone could measure and let me know it would be greatly appreciated.

Thanks,
Ross