" I'm glad to have found this as I'm looking for a two tank strap bcd replacement also. Suggestions?" from DestinyAnna.
I should have included this in my earlier response.
Re: Suggestions--I considered buying an aluminum single tank adapter like the stainless steel one offered by DGE* but cheaper. You can't just bolt it to the back of the Avid because there is nothing solid there; the plastic that broke only extends about 1/2" past the hole and is thin--that's why it broke. My plan was to get an aluminum plate (for example,
McMaster-Carr), slip this behind the holes and bolt it to the tank adapter with some stainless steel bolts & nuts.
I also saw a MacGyver style fix on line with a flattened pvc pipe molded to go in the holes left by the broken connections. Ingenious, but really ugly.
I figured it might cost me $100 to get the BCD working as I described. In my case, I would have tried it if I was going to use the BCD, but my plan was to get a BCD for my daughter, a new diver, and I thought it might be a bit too exciting for her if it didn't work. I could not, in good conscience, sell a BCD so modified, so I just traded it away for someone else's parts bin.
In the meantime, if anyone is still using these things (as is one of my dive buddies), I would suggest thinking ahead about what you will do when your tank floats by unattached to your body. One obvious solution is to grab your BCD inflator hose, which is still attached to your reg. At least this keeps the thing from jerking your second stage out of your mouth. Then you can put your tank under your arm and finish your dive. I also suggest clipping the hp hose of your air gauge to a D-ring (my desired configuration anyway). This gives you two points of contact with your tank other than the thing in your mouth. (Note: Maybe you should also have a plan about how to get these things off and your tank and reg back in the boat if you are on a boat dive.)
*(
Dive Rite Single Tank Adapter {13 in | 33 cm}