For sale is a 3D printed bracket so that you can use a Shiv bladder in the front end of your Felt IA. I bought this to use on my own bike but one of the screws seized up and I cannot get the old Calpac off. My loss your gain.
Asking $40 plus shipping for just the bracket/adapter (new is ~$80). Paypal only. US shipping only via USPS.
Updated/Edited: THIS IS JUST FOR THE ADAPTER; the bladder has been sold.
If you want to check out the details of the bracket here: https://www.shapeways.com/...000ml-fuelselage-mod