Here's a complete system for enlarging 35mm proofs:
This Beseler style carrier projects six 35mm proofs (1-3/4 x 2-5/8") onto 8x10.
With 11x14 paper you'll get six 2-7/8 x 4-1/4" proofs per sheet.
Use the unexposed area between pictures for notations, catalog numbers, etc.

The carrier is 8-3/8" diameter high density tempered hardboard.
The indexing pins on the underside (not shown) are 6-13/16" across the diagonal.
It fits into any enlarger having a baseplate opening of at least 6-13/16" diameter.
To my knowledge, this also includes the 4x5 D series Omega enlargers.

For even bigger images, enlarge them onto strips cut from 8x10 or 11x14 paper.
The smaller easel is for 2-11/16" wide by 10" or 11" long paper.
( 3 strips from 8x10", or 5 strips from 11x14")
The larger easel is for 3-1/2" wide by 14" long paper (3 strips from 11x14")
Made of tempered hardboard and cherry wood, they're classy looking and easy to use.

$43.50 for the Multi 35 negative carrier (+ shipping)
$19.50 for the smaller easel, $23.50 for the larger easel (+ shipping).