I have yet to have the opportunity to thoroughly mount and test the Rolock 90 set I was sent (particularly in the water), so I am not yet fully endorsing the product beyond stating it seems to be made from quality material and looks to be easy to mount gloves on, and easy to use.
Rolock 1, Rolock 2, and Rolock 3 are all the same basic system, but come with a different glove retention ring sized specifically for different type gloves. This system was designed to be mounted on glued latex seals
The Rolock 1 model comes with light blue glove retention rings which are sized specifically for use with size medium SHOWA/Atlas model 490 gloves with attached insulating liner, or similar glove.
The Rolock 2 model comes with black glove retention rings which are sized specifically for use with size large and extra large SHOWA/Atlas model 490 gloves with attached insulating liner, or similar glove.
The Rolock 3 model comes with red glove retention rings which are sized for use with gloves with a removable under-glove or gloves such as the SHOWA/Atlas 495 gloves with their removable yellow acrylic under glove, or the SHOWA 720 glove that does not come with an under-glove.
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Note: The insulating liner mentioned above is not the thin flocked liner of the glove but a thicker insulating layer (usually yellow) that is glued into the glove. Google images of the SHOWA 490 and 495 model gloves to understand what is being referred to.
Also...it is common to only see Rolock 3 listed on web stores as divers seem to be leaning to using gloves they can use a separate under-glove/liner with.
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The Rolock 90 is specifically designed for integration with the PU ring of the Si-Tech QCS oval system. It can be purchased as a complete kit with the dryglove system and PU rings, or the system without the PU rings if one already has them in their suit.
The Rolock 90 comes with a pair of dark blue and a pair of black glove retention rings. The dark blue retention rings are for use with gloves with removable under-gloves/no under-gloves (SHOWA 495, 720, etc.) and the black ring is for use with gloves with an attached insulating liner (SHOWA 490).
@RobPNW, Seaskin has received positive reviews on ScubaBoard for quality and value for price. Still, I would not "assume" anything and would reach out to them by whatever means available to you to check if they will automatically install the PU rings if you order a suit with the Rolock 90 system.
If you have any other questions about the system, don't hesitate to ask.
-Z