Planning to buy eBay spoiler and rear diffuser for my IS. Was wondering if anyone tried these? Also is molding required for better fitment?

 

They're hit or miss. I ordered a rep OEM spoiler and roof spoiler that actually came out very nice and pre painted. The actaul company is ikon motorsports but Ill have to log into my ebay acct to see which seller I bought them from. The spoiler fits like a glove but the roof spoiler cane two weeks after and its been too cold here at night to stick it on. But when I did a dry fit it fits nice and snug as well.

 

I have that same spoiler but branded "ikon motorsport" it's a great spoiler, quality is good, fitment is on point, I used some VHB 3m tape and it been there solid for months now. Fitment is really good just that the corners on top may lift up if you don't use enough double sided tape towards the corners. Overall I'd say it's 9/10 on fitment,