The only legal steering boss I know of is an Atiwe, which only has 3 x M8 - and the Momo has 6 x M6.
However, I belive Momo made a steering boss for the Talbot Samba, which also fits the Murena.
Then again, I once noticed, that the Samba and the Peut 205 share the same axis pattern. Then Momo suddenly is an almost legal option.
I think, I have both a Momo wheel and a 205-boss laying around somwhere in the garage - interested?
hmm what are you saying? the wheelspacer for 205 will fit murena?