Dan, I had to replace a round landing gear pad on our rig as soon as we got it home due to one literally falling off during our trip home with it. I took some photos of it along with a width measurement and sent these to our daughter and son-in-law (we affectionately consider him our 2nd son). He found what we needed on Amazon.com and after checking with me ordered them so they'd be here shortly after our arrival. This item was sold only in pairs, so that caused it to be more costly ($98 delivered) but regardless, we needed one, it fit and now I have a spare, just in case. These came from Lippert, matching what the rig came with. I don't know if yours are Lippert items or not but you might check Amazon or eBay to see if either have a larger pad.
Steve and LaDonna
2011 Mobile Suites 38TKSB3 #5509