WTB: Leaf Spring Mounting Plates

[72 Cheyenne K20]

I'm looking for front and rear mounting plates (plate with 4 holes where the u-bolts go through and sits on top of the leaf springs) with numbers 6274149 and 6274150 for the front (number stamped on top). Stock for 69-72 Blazers,K10 & K20 trucks. The rear numbers are 3762845 for both sides (numbers should be stamped on the outside of the axle bow of the plate. Came mostly on 20 and 30 series trucks from 55 to 72. Trying to build a numbers original truck or I wouldn't be so picky. Shipping is to 55060.

Thanks, Scott