We ended up getting a CSR Shield from A&A. After some heavy 5lb sledge work and lots of air hammer action we managed to stretch the tunnel enough to fit it in. We originally thought we would have to cut and modify the tunnel, I can't believe how far we are able to adjust the tunnel to fit the shield with plenty of clearance. We also had to cut holes for bell housing bolt access because with the shield there was no way to get to the top 2.