Here is a very helpful item for your XJ750. This is a complete engine gasket set for the 1981 1982 1983 and 1987 XJ750 Models. This includes the Seca, Maxim and Midnight Maxim.   Gasket set has all the gaskets you need for top-end and bottom end of the engine overhaul including valve seals! Please take a look at the photo so you can see what an extensive and helpful gasket set this is.  Expensive head gasket also included.  Top quality aftermarket item.  We only sell the best! That is it! We ship in the still sealed package, we just opened an extra set to show you what was inside.  We look forward to doing business with you. 

This is correct for these models:

Maxim 750 XJ750 (J, K),
Midnight Maxim XJ750M (K)
Seca XJ750R (H, J, K) Seca 750
1984 XJ750