Looks normal to me.

I mean, of course you'll have to get some bare wire on the ends with a wire stripper, but that's a normal part of installing a stereo.

Also, remember that the Mk1 did not have two separate wires for power like the Mk2 does. It only had one power wire for connecting to the ignition-switched wire. It also does not have a headlight-sense wire. Finally, remember that the wires are color-coded differently between the Mk1 and the Mk2. Be careful what you hook up.