Oh its in 50... I guess thats good and bad.
Good luck on the bipod. Watch GB, they come up ever few years. Of course I assume you know a regular 08/15 bipod will work.
I have had 4 or 5 of these bipods over the years. I still have 2. One came on my 08/15, so I don't want to break that up and one for the T-Gewehr. Both mine have the cast feet. I would not mind picking up or trading for one with stamped feet.
Sometimes you see them on 08/15s. You might try and have a spare 08/15 bipod and then offer to trade the seller of a 08/15 out for the bipod plus some cash to make it worth his time. He is unlikely to get much for a MG08/15 with that bipod, so he might take that as a bonus to the gun sale. However he is going to want one in trade as everyone wants a bipod with the gun.
Good luck!