in the Bosch catalogue.......no 00258 003 819 listed........to start with....but read on......
Only one Maserati item directly quoted......for a QP - on page 233
4.2 V8 32V 4,2 294 03.04→ 5 1000 0 258 007 272 160000 LS 7272
http://www.bosch-lambdasonde.de/en/downloads/lambda_sensor_catalogue.pdf
Then found this little section........
.....with Neils reference number( none have 2 zeros at start?), opposite another number.......(!?)
MASERATI Nos/ Bosch nos
180915 0 258 006 196...............selection of QPs/GT......£88
182837 0 258 007 001...............Front sensors ....4200 plus others.....£130
191412 0 258 006 486...............rear sensors at £78 for the 4200
383700107 0 258 003 819.......see below
383700139 0 258 006 193..........this one also for 3200AC...at £329 plus...not sure which countries.
As it turns out....the highlighted number on the left is on Eurospares( Neils no in right column)........
......original Maserati number? But listed as fitting the 3200AC and 3200...priced at £106.80!
http://www.eurospares.co.uk/searchResult.asp?find=&M=&Mo=&A=&B=&S=383700107
P