Ultralite locking wheel nuts

[Bud]

Currenlty using my OEM locking wheel nut of my Rota's but i have been told i shouldn't be using them due to the taper size

Will these be okay?

All my other nuts are ultralite ones

http://cgi.ebay.co.uk/Ultralite-tun...Wheels_tyres_Trim_Nuts_ET&hash=item51871df9c3

Rare rims do their own locking wheel nuts for £15 but the weight will most likley be slightly different compared my ultralite nuts

Will the locking wheel nut have to be the same weight as the other nuts or does it not matter

Thanks Dan