@Ley Grigg Are you talking the woven leather inserts? If so relicate leather in one place. Not sure if it’s the exact material singer uses. I can’t find a link to the product on their site. But show it here on their featured vehicles page
Garret leather supplies the woven leather. It is very price over $700 per yard (or per foot I can not remember). I believe Singer gets their woven material from Spinneybeck leather
The Singer material is indeed from Spinneybeck, I have used it on an old Alfa. It is made on a per-order basis and the minimum order is 55 square feet and I believe it's about $50 per square foot. With shipping, tax, etc... the minimum order was in the range of $3,000. Beautiful stuff, and beautifully made. Bonded onto a cotton backing and not a single join to be seen anywhere from what I could see. Aint cheap though.