Just suffered a puncture, fortunately in my own drive.

Replaced the wheel with the steel spare but the nuts don't seem to fit very well... are there supposed to be different nuts for the full size steel wheel spare? The leading edge of the nut doesn't fit through the steel wheel like it does on the alloy leaving the washer flapping about.

Not that I plan on driving very far as I'm fairly sure the spare is the 17 year old factory orignal Pirelli ;/

I'm afraid I can't directly answer your question, but to add to it, I wonder how many different spare wheel configurations were applied to the X300?

I also have a '97 3.2 and it is "ill" equipped with a steel space-saver spare. I know of some who have full size alloy spares, although they may have be an option. Curious to note that you have a full size steel. Could yours have been added to replace an original at some point, since the nuts are not fitting properly?

Steel wheels normally use a open wheel nut with a cone seat.

If you were in the US, they would be a dime a dozen because they
are the same as the nut used on older GM products.

My (UK) XJR's wheel nuts would not secure my XJ Sport's wheels - and vice versa. Both cars have alloys.

That makes sense, cheers, right, ebay!

Could well have done, the car came with little in the way of history and nothing in the way of receipts.