[Tiara Open] refrigerator replacement 89' 3300

[Game Plan]

Hi, i'm new to this forum.  Does anyone know whats the best fitting replacement fridge for a 89' 3300 open, assuming they only used one size. I removed and threw out the old norcold tek 2 (beyond repair) also without checking the model number.   Does anyone make one that fits without modifying the opening or adding trim? Thanks for any info