This is my first journey into the forum and any experienced feedback is greatly appreciated!

THE SET-UP:
When a listing asks for a 90's original recording (for example) and mentions "You must own or control your Master", it's easy to assume that mix variations will be eventually requested. However, my 90's masters are on ADAT and reel-to-reel. I don't own the equipment to play them back on anymore.
QUESTION:
Using the above example, if my "90's-submission" is "approved", should I expect to quickly rent a studio or gear on my dime to provide re-mixes or variations beyond the MP3 or WAV that I submit... OR is that something that would typically be compensated for in negotiations afterwards? Considering the technology gap from that era and equipment accessibility.
I'm only asking in order to factor that into my budget in such an instance. Tks!