You can get these nice spacers from FCP:
https://www.fcpeuro.com/products/uni...roducts-o2pair
I'm tempted to try them myself.
2002 X5 3.0 378,900 miles
2014 428i 68,000 miles
2004 325i sold at 123,600 miles
2001 325i sold at 66,000 miles
1970 Firebird Under restoration