The buy now price $1500.00 is to much considering the issues listed
Its most probably a 1976
You will need a good half day to rectify the centre case gasket. motor out , split it , rectify it , reassemble and refit motor
Seals minimum and probably bearings advisable while its apart.
Fix the non spark issue could be costly or could be very easy(you wouldnt know until you checked it out)
install correct front wheel etc if your fussy
1974 175 WR MK-00001 thru 10499
1975-1976 GP ML-00001 thru 05999
1983 WR WO-00001 and higher
1983 XC 175 XO-00001 and higher
realistically its probably worth $750.00 tops
Its would be a fantastic thing once it was sorted
If wasnt doing this 1978 CCM with my mate , i would make the guy an offer