I haven't one formatted drive in more than 100: SCSI, ATA, 40-pin, 50-pin, 68-pin or 80-pin that is not deliberately formatted with 512-Byte sectors, as opposed to those sinister upstart formatting protocols that use 514-Byte. Was this really your focus, or consistent with the ages of the Plus to SE crowd, was it interleave factor that was really on the tip of your tongue? Since, as you note, the drives that were contemporary with those Macs are dying out (as perhaps also are those Mac-owners who used them), modern 50-pin drives adapt quite nicely to the challenge. Perhaps an occasional Plus with an elderly Quantum may need Silverlining 5.8.3 to impose a 3:1 interleave, but generally it is no longer needed even if the SCSI ports on the Macs have not grown faster with age.

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e-less 'those' repaired.