Looks like I figured out the answer to my own question. I ordered the below adapter to update and replace the original hose and regulator.
http://www.grill-repair.com/images/parts/gasfitting2.jpg
00012
Brass fitting for gas hose connection. 3/8 inch flared male to 1/4 inch pipe male fitting used to join the hose and regulator to the manifold on pre-2110 Weber models and some others. The flared fitting does not need teflon tape or plumbers putty but the 1/4 inch pipe fitting does need a sealant when it is screwed into the manifold.
$6.
http://www.grill-repair.com/images/parts/gasfitting2.jpg
00012
Brass fitting for gas hose connection. 3/8 inch flared male to 1/4 inch pipe male fitting used to join the hose and regulator to the manifold on pre-2110 Weber models and some others. The flared fitting does not need teflon tape or plumbers putty but the 1/4 inch pipe fitting does need a sealant when it is screwed into the manifold.
$6.