I can confirm that applying for the current MileagePlus Explorer card offer you'll get the 55k sign-up bonus and $50 statement credit if still carrying the Mileage Plus Rewards card from Chase. I got the no-AF version MPR and the card history I think is at least 4 to 5 years old. Also, I don't think this card product is offered anymore. Images of the MPR and MPE shown below. Slight difference with mine is the MPR card itself is gold instead of sliver and says REWARDS above the 4417 digits.