Can't find my ball gate for a Target Alpha. Everyone's out of stock. Are there any alternate parts that would work in place of this gate?

I have searched ebay, added Want Ad on pinside, searched all resellers. Zilch. My concern is that similar ball gates I find at marco etc don't have proper dimensions to work on this machine (else they would usually be listed as suitable replacements for this particular part number).

Haven't called him but the PBR website (and everyone else) has them out of stock. Modifying another seems like the only option at this point.