transition from 76mm on one leg to 61mm on the other. The silicone should be both sturdy enough and provide enough flexibility to get the job done. Cost - $74 shipped from Cybercraft. Then I am going to get a second MAF sensor (is $150 too much for one?), and use the 2-in Add setting on my S-AFC. I already paid for a second POP charger ($65), so my total will still be a little under $300 for everything.