Speedway IMCA Approved Aftermarket Metric Spindle

[Verdoorn Racing]

Has anybody bought one of these yet? Do they weigh more or less than stock ones? http://www.speedwaymotors.com/Speedway-Motors-3-Piece-1979-Up-IMCA-GM-Metric-Midsize-Spindle,107467.html

Thanks
Jeff V.