Not sure if anyone's put these in a '40 replica, but if it'd fit, it looks good value
eBay.co.uk: Kit Car Balance Bar Pedal Box with cylinders *£159.99* (item 230042786161 end time 04-Nov-06 08:13:47 GMT)
eBay.co.uk: Kit Car Balance Bar Pedal Box with cylinders *£159.99* (item 230042786161 end time 04-Nov-06 08:13:47 GMT)