James,
You need the Moto-Lita GT40 OEM 14" flat steering wheel. This comes with a choice of blue or black leather and may take up to 6 weeks to deliver, as the blanks have to be sent for anodising. The cost is £117+VAT (in 2004). This is the ONLY wheel to use.
Moto-Lita Ltd
Thruxton Airport Industrial Estate
ANDOVER
SP11 8PW
Tel: 01254 772811
Frank Catt (01323 843839) does a boss that fits the Moto-Lita wheel for around £40 including caphead bolts and nuts.
Paul Thompson (01428 741049) does the Ford GT sticker that fits in the centre of the boss.