Parts originally manufactured for this specific model? I'm afraid not. My telescope was also purchased by one or both of my parents when I would've been about 7 or 8 at the oldest, and the new eyepieces + adapter were gifts. However, I am pretty good at playing internet detective, so I think I've managed to find the listings for my upgraded load-out online. :y
(Here)[https://www.walmart.com/ip/Gosky-Astronomical-Telescope-Accessory-Kit-with-Telescope-Plossl-Eyepieces-Set-Filter-Set-2X-Barlow-Lens/721376893] is the Plossl eyepiece kit that I use that replaced the 25mm Huygens that originally came with the telecope, and they work perfectly well! Though you may also need to measure the slot where it the eyepiece ought to sit, since my telescope was made for eyepieces with a .965" barrel, meaning I also got (this adapter)[https://telescopes.net/orion-0-965-to-1-25-telescope-eyepiece-adapter.html] (or one very close to it) with the kit, so that the 1.25" Plossl eyepieces could attach properly. However, all the specs I've dug up for (presumably newer) Telestar models list the barrel diameter as being 1.25" already, so you may not need the additional piece depending on what you have. Just grab a ruler and check to make sure.
Additionally: in looking for those, I did also dig up listings for individual pieces like the kind of (Huygens eyepiece)[https://www.amazon.com/Baoblaze-Astronomy-Telescope-Eyepiece-Multi-coated/dp/B07FD9DYLV] that would've originally come with the telescope, (Barlow lenses)[https://www.amazon.com/SVBONY-Magnification-Broadband-Standard-Telescope/dp/B00WW0TC32/ref=pd_day0fbt_img_1/147-0689248-4963939?pd_rd_w=4do6J&pf_rd_p=bcb8482a-3db5-4b0b-9f15-b86e24acdb00&pf_rd_r=N4VCCGVC9XQX3SEK853T&pd_rd_r=dcb5e80c-ad...], and (diagonals)[https://www.amazon.com/dp/B07VQH9PLF/ref=sspa_dk_detail_5?psc=1&pd_rd_i=B07VQH9PLF&pd_rd_w=M7ReN&pf_rd_p=5d846283-ed3e-4512-a744-a30f97c5d738&pd_rd_wg=sfbEP&pf_rd_r=N4VCCGVC9XQX3SEK853T&pd_rd_r=dcb5e80c-ad45-4aca-b188-dc2cf...], all of which appear fairly universal provided you get the right diameter for your scope.