Backlight repair question

Attempting to replace the led strips on an LG 55um7300 that went all blue. The exact strip model isn't made anymore, but an alternative model was suggested.

Unfortunately, the original model has lens caps that were about 1-5/8" wide and the suggested replacements are almost a 1/4" smaller, which means they no longer snap into the holes in the backlight sheet.

I'm being told by the vendor that I can just use them anyway, that they are the correct replacement model, and that I could use clear tape if the backlight sheet needs to be secured with the lens caps no longer supporting it.

Does this make sense, or they just want to avoid a return?