Actually you are correct. We did make a few five pattern 30-spline flanges (5-30) but we decided that if you are running 30-spline output shafts, then you aren't gonna be using the early flanges with tiny 8.2mm driveline bolts, so we removed that pattern.
That pattern is still available on our five pattern 27-spline heavy duty flange, the
5-27.
