Here is a link to the ballot horses
https://www.justhorseracing.com.au/melbourne-cup/melbourne-cup-order-of-entry
Only 24 run so you need to be as close to 24 as possible. Withhold is 49th but Stratum is so far down the list it doesn't have a number!
ETA PP has Withhold at 14/1 (from 16s)...
I think it unlikely either will get in the race without winning a prep. as they have been allocated very low weights. So low in fact that Winston R will not be able to ride either should they get in the race.
Therefore be careful if betting ante-post!