Look at the posts for "Space Saver Spare" under the General Technical heading on this forum. I'll copy the pertinent parts here:
Ricardo Baerga
(Impala) posted 5/23/2004 10:56:39 AM
--------------------------------------------------------------------------------
I bought a T125 70D 15 spare saver from a Chrysler Stratus at a junkyard and mounted it on a 4-1/2" by 15" VW wheel. It fit perfectly; I've also seen them mounted to 5-1/2" wide rims without problems.
Gordon Nichols
(nichols1)
Donating Member
Registered Owner posted 5/24/2004 2:10:39 PM
--------------------------------------------------------------------------------
Joe: I have 16" Fuchs rims and wanted a 16" spare, so I have a T125-80-D16 mounted on what looks like a 4 1/2 inch rim. It's only a regular tire, just smaller than usual and mounted on a small rim compared to those wide, American-car rims.
As Ricardo suggested, if you have a 4 1/2 or 5 1/2 inch VW rim, go to a local junk yard and see if you can get a T125X15" or 16" space saver spare and have a tire place re-mount it on your VW rim. Should work like a charm.