In the link mine is “1”. It seems to be interchangeable based on applications. Perhaps why it says RH. The illustration shows it can go on either side. For the 4g63 this engine cover will go on the LH driver side. Just disregard the RH part. The part number is correct tho.
Check my PM. You have the passenger side. The link you show has the non-turbo (upper "1"), and turbo (lower "1"). The picture in your ad is the lower left, ie. passenger side or "RH" for the turbo model (MB908262 is the passenger side.). This is a better link to see RS/GS vs GS-T/GSX https://www.factorymitsubishiparts....ipse--gsx--2-0l-l4-gas/engine--splash-shields
Do an internet search for each part number and you'll see (MB908261 & MB908262).
https://www.google.com/search?q=mb9...6BAgBEAM&biw=384&bih=723#imgrc=vqI8oFpr0tgLsM
In your link, the "2" goes into the slot I mentioned. Yours is the passenger side.