My 1st thought is/was they slide Hornish into that seat.
However Vickers who has shown he can still drive when he has driven the 55 car this year, could be a possiblity.
Everyone figures he will share the 55 with Mark again next year, but if Penske were to offer him a full time ride he would be a fool to not take it. Part time ride or a full time ride? To me it would be an easy choice for Vickers. Since Mark has already stated he will be driving next year no matter what. I wish he would just retire & stop screwing up quality rides.
Still think Hornish would be my 1st thought, but Vickers would be some food for thought.