I see Tobin has already posted, and he is the man; but for what it's worth, a back mounted bc or wing that has the corrugated hose in the center can be adjusted so that the elbow is clocked to point over either shoulder. Additionally, some older BC had the option of placing the corrugated hose on either side.
http://cgi.ebay.com/US-DIVER-CALYPSO-SBC-SCUBA-BC-VEST-L-/190403405056?cmd=ViewItem&pt=LH_DefaultDomain_2&hash=item2c54ed6500
Also, other USD had a very simple inflator/deflator mechanism positioned on the diver's right.
http://www.google.com/images?hl=en&q=vintage%20us%20divers%20bc&um=1&ie=UTF-8&source=og&sa=N&tab=wi
If you're into DIY, here is a thread that shows how to place the elbow pretty much anywhere you want it and close the original hole.
http://www.scubaboard.com/forums/2807870-post20.html
c
http://cgi.ebay.com/US-DIVER-CALYPSO-SBC-SCUBA-BC-VEST-L-/190403405056?cmd=ViewItem&pt=LH_DefaultDomain_2&hash=item2c54ed6500
Also, other USD had a very simple inflator/deflator mechanism positioned on the diver's right.
http://www.google.com/images?hl=en&q=vintage%20us%20divers%20bc&um=1&ie=UTF-8&source=og&sa=N&tab=wi
If you're into DIY, here is a thread that shows how to place the elbow pretty much anywhere you want it and close the original hole.
http://www.scubaboard.com/forums/2807870-post20.html
c