I use the Iron Gym as well, and I remember that there was an insert in the box to order extenders for extra wide doorways.
While looking for a link for them online, I found some extenders on Amazon, but the reviews are terrible. However, someone posted this DIY version in the reviews, and several people commented on how good it works. Makes sense:
I junked them and instead made my own extension bars that have worked out GREAT! I purchased two 1/2" by 12" steel tubes from my local hardware store (plumbing section) and slid them into each end after removing the end caps. They slide in perfectly and stop when they hit a set of screws. To tighten the fit and to make them just a little bit longer, I used electrical tape and taped three nickels to each end and slid them again again (nickel side first). Perfect! Then I just put the end caps on the the exposed threaded end of the steel tube (the end caps go OVER the steel tube) and slid the piece of foam back over the exposed steel. You would never even be able to tell that these were extended!
The bottom line is that if you door is too wide for the door gym (which again is an AWESOME product), don't stress, but also don't buy these. 1/2" steel tubing works great, can be had for under five bucks and can be as long or as short as you need them to be.
It was further expanded upon by another user:
I did exactly as he said, bought 2) 13"x 1/2" black pipes, put them in the hole, and electrically taped them together when the original bar ended and the home bought bar protruded. However, I found a much better solution to the nickels. Instead, I used 3/4" white rubber chair leg tips to go over the exposed end of the bar. Works great!!!! Don't buy the extenders! The bars, tape, and rubber tips cost only $5.34!
Go here if you feel you need to upvote the original reviews.