[Aussie Mike]

Unfortunately I can't comment on their performance as I haven't used them in anger yet. They should work fine, they pull up an 1800KG holden OK. They are significantly lighter than the Jag setup too.

I don't think the authorities will have a problem with re drilling the holes in the disc. If you wanted to change to a Ford pattern there's plenty of space to drill the new pattern in the 5 spaces between the original pattern. It's not reducing the strength of the piece.

The pattern for the holes was pretty straight forward. Modern Holden pattern has a PCD (Pitch Circle Diameter) of 120mm. When Holden went Metric they must have just taken the closest metric round number to their old standard 4 3/4" PCD (120.65mm). The Jag front runs 4 3/4" PCD. To make the discs fit I just machined each hole out a further 0.325mm to match the old pattern.

I used the rotary table on my mill and after drilling the first hole out just rotated the table 72 degrees to find the next hole (360/5). When mounted on the car the disc is centered over the spigot of the hub the wheel lugs just clamp the wheel on and provide the drive The disc is sandwiched between.

If you wanted to go with Ford pattern you would just machine a new set of holes with a the smaller Ford 4 1/2" PCD. I would have done this if I didn't already have my wheels.

Hope this makes sense.

Cheers