I need to fit a chart plotter combo into a nice gloss white dash panel where a previous combo was fitted.
The big challange is the existing hole is bigger in depth than the new combo.
Any suggestions how I can do the installation so it looks the part and professional

The other thing to check is if the manufacturer of your new plotter does a surround for it to go into a larger existing hole

GME do this for their VHF radios if you are replacing a early large radio with a new smaller model

Regards Don

Thanks for the suggestions.

I contacted Garmin who do not have infill panels - damm. I thought this was odd as I am sure I am not the only boater with this requirement.
While doing the potentially 'proper method' the chance of getting a long lasting successful colour match is risky.

So I am now thinking of visiting a plastic product business and seeing what they can do

If you are going to go the plastic route i would measure the size you need and unless you want to cut it out yourself this company near you should be able to cut it to size www.specialisedwholesale.com.au/manufacturing

Regards Don

Good idea thought this would be an option.
Just trying to get comfortable that the finished job will look professional.
Another option is to sell my combo unit and buy a physically larger combo.