Post a photo here George and some members will doubtless be able to identify them for you. Also include either size details of the tyres or a photo showing the sidewall details, just to confirm the rim diameter in case someone has fitted something non-standard.
Hi George. Dunlop D1 caps with the Dunlop logo are readily available on eBay or from MiniSport in the UK. It looks to me as if 'blank' caps are available too, so if you can't get caps with the Bug logo (did Bug caps actually ever get their own logo?) you can always get blank caps and stick on Bug decals.