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Decals for the Alien Narcissus escape shuttle models are very difficult to obtain these days.
Here is a set of decals in vector format contained in a PDF document.
The decals are available as part of a detailing kit for the studio scale Narcissus model from ImperialPrintHub but even at the price of the detail kit this works out very good value for money even if you only need the decals.
Whether you are going to print your own on water slide decal paper or get them professionally printed this is probably the best set available right now.
Being in vector format these are simple to resize to the scale of the required model using a graphics package. Decals are supplied in 100% and 40% size for the Studio Scale Narcissus model sold by ImperialPrintHubs on Etsy.
The detail kit also includes a decal placement guide.