Ready for spacers, where to get them

[NO_H2O]

If I grind off the extra threads on the rear stub axle I can get away with a 3/8 spacer from Topline $30 pr. It's the front left bearing cover with the speedo cable that is killing me. Can I cut it down? I need to so I can keep the cool Porsche caps in the wheels. If I use a 1/2 spacer I would have 9/16 thread engagement, 3/8 spacer will have 11/16 thread engagement in the lug nut with the studs I have. I realy want to stay with 3/8 spacer