Sadly ESP is a factory installed item as part of the ABS, Traction control etc. I've never heard of any vehicle having it installed if built without it. Sliding windows can be bought aftermarket quite easily and they look identical to factory units. Which state are you in so maybe others can refer you? As to trip computer, I'm not sure if you can simply just insert the dash screen and module from spare parts or secondhand/wreckers. You also need the switch gear on the indicator stalks replaced to control the trip computer. Did you ask the dealer about their ability to retro-fit these items. Either way it won't be cheap if it's possible.
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