Have you looked at this forum post as it seems to refer to the part you require.
What is the part number for a front case fan/bracket for the XPS 8930? I've read that the Aurora R5-R7 front case fan will work, but I see several: 78KPW, 7M0F5. Not sure which to order. Apologies if this is already answered in one of the numerous fan upgrade threads, I did look. I have a i7-8700 (non-K), Geforce 1070 and recently started playing New World and it is LOUD. Ordered a top fan and bracket, the Dell CPU fan with heatsink, but would like to add a front fan as well. I monitored temperatures during a gaming session and both CPU and GPU are running very hot. Thank you
XPS 8930, front fan bracket