A '67 Imperial uses a 5" bolt pattern....not a 4 1/2". My two cents worth is to forget the respline also. I've seen too many failures and bad fits. I'm sure if you get the correct axles and the shop chops them the correct length and then heat treats them the correct amount, that they will work fine but why bother with all those variables when there are bullet proof ones on the shelf that are better than stock in all respects?