It won't fit (without modification of the stock chassis). J-Pap has to use WGP chassis with WGP pod. Watch attached picture.
WGP Pod is same as X1.. but your right on the chassis though. The WGP t-bar has a longer/bigger cut-out, hence why it feels softer than standard 104 bar. I am liking the one-piece bottom though (picked up the 3-racing version to use, and run the 1.3mm thick).
Regards
Ed