The normal fee for a single digit number is 50-70k extra on top of normal reg fee
for two digit same number i.e 11, 22, 88 etc
It ll be around 20-25k extra
for a normal two digit number i.e 14, 26, 46 etc 12-15k extra is charged
thats for isbd registration
and lastly, Don't have have any idea about the reg cost on a 660cc