Cardone 42-309 (limited lifetime warr.) fits my 2011 Winnebago Vista 35F Kwikee 2 step. It's not an exact fit as I had to drill out the motor bolt holes and I will have to use a smaller bolt head for one of the bolts, either that or grind down the head diameter a touch. Right now the stairs are working like a charm and I'll get that 3rd bolt in town tomorrow. Thanks to OP and all for posting your findings.
2011 Vista 35F, Ford V10, 22k Chassis, 2015 Jeep Unlimited Sahara, 960W Solar, CHF, 5 Star Tuning, Safe-T-Steer