Lith-O-Roll Middle Ink Form Roller DG-395-786-02
Didde Web Press #395-786

Listing is for both Rollers.

Lith-O-Roll no longer makes the DG 395-786-02  (Didde #395-786) due to lack of sales
It's shown in their 2008 Price List @ $212.00 each.

I can't find this part in the Lith-O-Roll 2016 Catalog but I did find the DG-534-02 (411-534) roller and it all but matches the dimensions for that roller position other than it's 3/16" shy of the 20 9/16" specs in the catalog and slightly wider bearing to bearing.
2016 Price List shows #411-534 @ $183.00 each

These Rollers are from a shop that had a Didde Viper and the box they came in has the #395-786 part number on it.

These Rollers should fit the Didde VIP, Viper & XL-900

1 15/16" Diameter
20 3/8" Surface Length   (20 9/16" Lith-O-Roll Spec)
22 1/2" Overall Length    (22 5/16" Lith-O-Roll Spec)

I have listings for other Rollers that Fit the VIP, Viper and XL-900

I'm a former Didde Web Press Service Tech that still does Service on Didde Presses.