Hi Murad,Hey! I know is super late but I just got a gretsch jet baritone and new fender 24-100 bass vi string, the lowest one won't fit neither in stop tail or tuners. Any ideas/instruction how can I fit them in?
Exactly which Gretsch Jet Model did you get - and importantly, with a Bigsby (i.e. as in the last two photos with a G5265 above) or is it really a Stop Tail?
Exactly where & how are the strings not fitting?
Due to length and/or diameter?
The scale length for the newer G5260 (stop tail) and G5260T (Bigsby) are also 29.75"; however, if it has a stop tail, the string length required will be shorter than on the G5260T and old G5265 w/ a Bigsby (the Bigsby adds a good couple of extra inches to the length of the strings. The old Fender 5350 Bass VI (25-95) strings fit the Bigsby G5265 and I would expect also the G5260T Bigsby model.
If you do not have a Bigsby, this will move the thicker full winding of the string closer to the peg and can cause you not to be able to thread & have few enough winds for the small pegs.
The newer G5260s are also sold now as Baritones with .014-.072 gauge strings, so the stop tail notch (and definitely nut slots) may not be optimal for a .100 string and cause some widening to be required for this gauge.
There are some Gretsch Baritone discussions here on TB for E-E tuning and strings used, but pay close attention to the poster if they have a Bigsby or Hard Tail model.... it makes a difference which strings will work: https://www.talkbass.com/threads/updated-gretsch-baritone-bass-vi.1444228/
People there are using lighter gauges than the VI set you bought.
I know Pyramid (and others) can put together custom sets for you (did it myself with flats years ago for E1 tuning on the old G5265), I'm sure they would assist with rounds. @gingermil has ordered a custom 25 - 100 set from them for his Fender Jaguar Baritone Custom VI (28.5 scale length) but hasn't gotten back on it yet here: https://www.talkbass.com/threads/fender-jaguar-baritone-vi.1617922/#post-27762662
You would still need to attend to the nut and tailpiece to accommodate for the thicker strings though.