Is there a difference of length on the 904 transmission dip stick

Not quite sure what you're asking here, there are a number of different length dipsticks and tubes- the dipstick is generally only slightly longer than the tube, by about 1/4". So, if you have a tube with an overall length of 19", the dipstick should have a working length (cap to tip) of about 19 1/4", etc. etc.