Series l seat belts? ?

I've been trying to find a set of s1 front belts,but l can't seem to find any for sale?

Also how much should I pay if l actually find a set ?

Cheers 

well there were 2 styles.
door mounted shoulder belts only
polled out from the inner seat back bottoms and fastened to door.

shoulder and lap belts

which are you looking for.

Shoulder and lap belt l believe . I had a set on a old M k l , fabric loop that clipped in on the side of the seat.