Just realized that both of my outers are torn.
Porsche 944 or 968 boots fit, don't recall exactly but search and you'll find it. Ricambi is pretty affordable, that's where I got mine.
Always check the new "F355 interchangeable parts" thread at the top of this section of the forum...it is a sticky. Here is the info: http://www.ferrarichat.com/forum/showpost.php?p=140733056&postcount=7 But I cannot confirm the accuracy.
I think you're looking for the split-type boot that is available for VW swing axle cars. Because the axle shafts on the 355 rotate rather fast and are continuously flexing around their entire diameter.(VW axle tubes do not rotate and only flex up & down) the split-type boot would probably not work very well. If only it was so simple. Image Unavailable, Please Login
If they are ripped, I would take the time to clean and re-pack the bearings. Yes, it's a horribly messy job, but relatively easy. Go to Auto Zone and buy a $10.00 bearing packer, it saves a lot of hassle. Do a search, there are several great threads on this subject.
Don't F355's have sealed bearings? Mine does...not to worry, though; replacement bearings are about $100.00 each.
I've done this job. It's not too bad. After R&Ring the engine and transmission on two separate occasions, I was glad to 'only' be doing the CV boots. And just get the boot kit from Ricambi, it's affordable.
You only need one kit also. The boots are the same in and out, so you can use both where you need. The official ones aren't very expensive, so this is one I would just stay with the OEM parts.
I am going this route on my 348 Spider: https://www.pegasusautoracing.com/productdetails.asp?RecID=5549 The 348 Spider uses the same boot as the 355.