I am going to do a re-seal on the Cummins in my 1845c. There is a leak in the cover behind the radiator so I am going to do the oil pan etc at the same time. My machine was manufactured in 2000 so I am assuming it is the 4BT Cummins diesel from research. The gasket kit prices are all over the board. The original kit through Case has been reassigned to part# 87447514 for $200-$250. There are after market kits from $75-$150. Thoughts on aftermarket? I am generally an OEM buyer but I am not going to use the entire kit immediately (only need a few gaskets from the kit) but I like the idea of having other spares available if something else fails.