They are not that rare tobe honest alot of race team still use them today

Tony is right the early RL 7's use to crack..... the ones without the extra strenting at the rear of the spoke they are the ones that use to crack .....

if they look like this first pic No 1,these are the early RL7 notice they are not strenthend in the rear of the spoke like pic No2




theses were th later type that have been strenthend



cheers Marco