Ian

Im guessing a bit here but I guess the 8 pins on the DPDT are arranged with two on one end and six on the other:
[: :::]

The two on their own are the coil contacts. Each of the SPDT will also have two coil contacts. You need to identify which they are and connect them to where the DPDT coil was. They should be connected in parallel. This is probably best done by soldering wires to the original PCB then either soldering to the SPDT or buying the correct connector(s) and using them (Technobots sell some nice crimp connectors).
The centre pair of the six other connectors are the common or change over (CO). The SPDT will also each have a CO.
Of the four contacts now left, the two closest to the coil contacts are the normally closed (NC), and the last two on the end are the normally open (NO). They are arranged so that the three on one side will go to one SPDT and the other three will go to the other.
If you get stuck there should be a little circuit diagram on the case somewhere showing which connectors are which like this:

` ` `.~~~. ` coil
` ` ` ` ` ` ` ` `
NO.__ ` ` __.NC
` ` ` ` `/ ` ` `
` ` ` ` / ` ` `
` ` ` `| ` ` ` `
` ` ` `| ` ` ` `
` ` ` `* ` ` ` `
` ` ` CO ` ` ` `

If this isnt clear I could try to draw a full circuit diagram.

Mark