You know the size of the bag opening there's a way. Say it's 2" you get 2 PVC or abs 45 degree fittings. You put the first 45 at inlet of the bag. Put about a 3" piece then the next 45. Then you can put another piece on or just keep it as it is. You throw on a f&g bag on it and something to hold it down and your set. If you wanted add 6" 8" piece then a short sweep 90. That is close to type y bags or f bags.
A fellow member onery came up with this on his 235 royal.
If