The So Called Compatibility /Fitment Modification is not jut for Pro Gear stuff .They won't work on my stock gear either .
Here they are in a Pro Challenger Gear and a Factory Gear . The Washer will NOT fit properly in either one with out doing some serious grinding and filing .

And the washer from Smooth Drag. Standard thickness fits FINE in Both Pro Gear and Stock Gear.

In this pic you can see the miss matched shape .
On Top is how it is suppose to be . The Bottom washer is Too Fat and tall to work

Suffice it to SAY you can fiddle around and make these work but this is NOT the Quality of LASER CUT parts I am accustomed to and was disappointed in the response I got from the Maker when I asked him if he had had any problems with these and here is what he replied.
Bryan Young
Ultimate Upgrades Drags
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Re: 7 + 1 Drag Kit Penn 113
Sent to: Wompus Cat on: May 07, 2022, 09:18:08 AM You have forwarded or responded to this message.
Quote from: Wompus Cat on May 06, 2022, 11:00:09 PM
Have you had any complaints about fitment with these?
The reason I ask is I got a kit with some parts I bought from a Member here and the Tangs on the Metal Washers are Offset about 8 degrees so they will Not seat properly in the Gear.
From Bryan
I have never had a complaint about the fitment for the 113 drag kit. The washers are designed on CAD and are 180 degrees opposite each other if there is something off, then it's likely not be my washers. Can you send me a photo of the fitment issues to hawaiianfishinboy@yahoo.com?Apparently he has not read the info I found on Mystic about the Problem they found with them and suggested you modify them to fit .