That is one complaint that I have with Marlin. They are always out of stock of the things you want to buy. Check the classifieds. There is a guy selling a set of brand new 25mm high steer arms they are for a mini axle. The arms on a 60 are the same, only difference is the tie rod and drag link length. Hurry before they get sold. Here is the thread.
http://board.marlincrawler.com/index.php?topic=96174.0