Correct size rubber for 40c/420c/430c

[tobaccofarmer]

Guys in process of ordering a set of rubber tracks for a 40c 5 roller and want to be certain the size is correct . So far 300x71x74 is what research pulls up but there’s also a possibility of 300x71x72 which is obviously slightly shorter 3ish inches . Just would like to hear from a guy that has actually done this to verify what size they used and what machine it was put on . Any help to solidify the size would be greatly appreciated .