I'm not 100% but I reckon yes... I know I'm running 8" with equivalent ET37, which is same as 8.5" ET 42, and i reckon with the extra strecth on a 9" rim and i reckon i've got a little room to spare... SO I'm saying yes... But don;t hold me to it :)
This is on the back, on the front i reckon you'll get rubbage... :(