The folks left off P&S in Downey, Ca who built the FIRST atermarket versions and Stiletto from Woodhaven Industries in illinois and Mark Williams- they're all good but IMHOP a little lightweight for heavy front-ended cars- Although the 66 roadster guys run them and set a record at WF's.
Check out Speedway Motors Chevy-based spindles for circle-types if you're concerned aboput weight loads.