Just replaced the OEM's on my 2019 signature with PIAA Si-tech wipers and they fit fine. They came with the need attachments in the package. https://www.amazon.com/dp/ (commissions earned)
Thanks..so you got the : PIAA 97045 Si-Tech Silicone Wiper Blade - 18" 450mm (Pack of 1) I am assuming you also got the 24 inch also, correct with no fitment issues.
How are they doing and holding up? no shuddering issues ? stays solid on the windshield? snow / rain?
I only got the 24" originally and it fit fine with the included adapter. It worked ok for awhile, then started chattering. I did also get the 18" later, but it didn't come with the correct adapter so I returned it. Currently I'm using the Trico's but will probably give the Bosch's a try mentioned earlier in this thread.