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SCSI in parallel port

Can anyone advise me on attaching a SCSI external drive (SyQuest SyJet 1.5 GB) to a parallel port? SyQuest sells a cable ("adapter") for this purpose with an integral printer passthru for $100. However, a computer shop tells me to try a plain SCSI to parallel cable, which costs about $40. Two questions:

1. Will the plain cable work?

2. If possibly not, could trying it cause damage to the drive and/or computer?

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Does anyone have more detail or knowledge on this question? If I can avoid paying $100 for a cable, I would like to! The $40 cable had the wrong kind of SCSI plug on it. Here is a description of the SyQuest cable.

I guess the basic question is whether the thing is just "adapting" the plugs/sockets or if it performs some other function that enables the SyJet SCSI drive to handle parallel. If something that would work would be available, say at Radio Shack, or if I could assemble one with various adapter plugs and cables, I would like to know about it -thanks!

Here is the description:

SyGear SyJet SCSI-to-Parallel Port Converter
$99.99

Description
This conversion cable enables you to attach and run an external
SCSI SyJet drive through a PC's parallel port. It has a DB25 male
connector on one end for connecting to a parallel port, and a 50-pin
High Density male SCSI connector to plug into the SyJet drive. The
special cable also has a DB25 female parallel port for parallel
(printer) pass-through.

Product Details
Shipping Weight
1.1 lbs
Mfr. Part No.
SYGEAR-009

Product Features
Connectors
SCSI 50-pin High
Density (Ext.)
Connectors
Parallel DB-25
(A)
Type
Parallel
Type
SCSI
Sub-Type
Adapter