Hello thanks for the reply, they are on a volumex and I'm not sure that either of them are original.
Your reply Doug is helpful, I'm not sure what the wide part of the tube seal is, can I assume that is where the dipstick seats or is it the top lip which the dipstick sits upon?
I've drawn a diagram with what my interpretation is of you measurements, it would be great to have you cast your eye over it.
Thanks,
Adam