Lug bolts mod

[tihol tiholov]

Hi all,
Got some TSW and some Ford Escort wheels, both with cone-shaped lug bolt seats.  I'm told they're "standard" cone, should mean 60 degrees.  Saw somewhere that 90 deg cone seats exist, too.  
? Can anyone confirm this?

Trying to fit the wheels on VAG products: Escort on Typ 89 and TSW on a New Beetle.  Cone-shaped bolts were recommended @ $5+ bux each.  That'll put me at about 200 bux for all - kinda steep I find.  Thinking of machinig some OEM VAG bolts (got lots of those) from ball seat to cone seats.  Anyone done that and kept the wheels on the car?  
Any advice about this whole thing would be appreciated.
TIA,
Tihol   

TT