I've seen some good ones from Cl***ic Instruments, there are adapters that you can get to fit their larger (5") gauges into the stock speedo opening.
How about a Morris 1000 speedo http://cgi.ebay.co.uk/Morris-Minor-...arts_Vehicles_CarParts_SM&hash=item230a0e2b10 Gold faced earlier car black faced later car http://cgi.ebay.co.uk/Morris-Minor-...arts_Vehicles_CarParts_SM&hash=item3360c86ca4 The early mini is very similar to this, 5" dia if I remember correctly. the cl***ic mini also comes in it,s own steel binnacle. http://cgi.ebay.co.uk/Morris-Minor-...arts_Vehicles_CarParts_SM&hash=item3360c86ca4 http://cgi.ebay.co.uk/Early-Mini-Sp...arts_Vehicles_CarParts_SM&hash=item3f02e85fc9 Most British cars of the 50's and 60,s have similar instruments.(except Ford)