Hi - can anyone help with part numbers for front shocks? Or can do a look up for me?

Called audi dealer parts dept but they could only narrow it down to 2 different sets, with the difference being "one has a yellow paint mark on it". I believe there was a change in part number at some point through the VIN range though the dealer didn't make any reference to this (possibly a different spring perch if my research is correct?). And they are on back order.

1999 facelift saloon 1.9tdi AHU engine. Standard suspension. FWD.

I've been given possible part numbers of:

8do 413 031 bm
3bo 413 031 ad

I'd rather not have to take the parts off before I can go shopping! I'll probably stick Sachs back on as I believe that's what it came with.

Any ideas?

Thanks.

RJC