Do they used an adhesive to attach to the car?
Yoshi's does. The OEM used back screws, through mounting holes, where the shields held into the recessed fender points via nuts of sort, and making the shields almost entirely flush.
Yoshi, mfgr's shields that are 1/3 the thickness of OEM shields. Shoot, I sold a pair to FL owner, 348 [he the Queen's carriage driver] that were Baccarats[sic] that were HEAVY and better quality IMO than OEM a few years ago.
Yoshi's uses a 3M tape which is very strong: no need to worry they'll come off. SO, placing them correctly should be done with care. I'm sure he would help fix them. They ride very tightly on fender BUT you'll need to make some very nice adjustments for clean fit WHICH IS VERY important: Don't rush any of this mounting. Make sure the shields are flat on the curvature of the fender points, and point to mount understood. MEASURE 2x 3x then mount once.
Mondial T's NEVER had the shield option. Thus, you'll not see ones with recessed shield points. Yoshi makes the correct 'near' attempt to satisfy a person IMO.
Yoshi is typically doing his day job, and is sometimes difficult to communicate with, but his web site is somewhat very good. He is a stand up guy and makes good his product: I had one set with messed up backing and he replaced them right away.