V8 distributors?

After some quick testing it became clear that the distributor vacuum advance was not working. Im now finding it difficult to find the correct replacement part as i dont know what type of dizzy ive got. Its a 95 V8 3.9 efi with two wires coming out the back that connect to the harness. But i was expecting to find an amp mounted on the back like the ones shown in pictures that say its for my engine. No amp only two wires

Has this been modded or is this a standard fit.

I would like to know this aswell as mine is the same and my vac advance isn't working!

it will be on coil bracket

James is right, it's STC1186

Check out ignitioncarparts.co.uk they should be able to sort you out.
Recently bought a whole new dizzy for £110 with a 2 year guarantee.
Works perfectly.

You don't need a whole dissy just the vac unit I do have a supplier for them