The library chimneypiece was executed with minor alterations to this design, with a slightly different tablet. The tablet was executed by William Collins in 1767, and the remains of the chimneypiece were carved by John Devall, who charged £41.14s.6d in July 1767. The chimneypiece survives in situ.

There is a variant Adam office design for the chimneypiece, dated 1766, in the private collection of Lord St Oswald. This gives the same design, but without sphinxes in the tablet. There are four Adam office working drawings for different parts of the library chimneypieces, all datable to 1766, within the National Trust drawings collection at Nostell. There is a fifth working drawing for the overmantel frame, in Robert Adam’s own hand and dated 23 May 1767, within the family archive at the West Yorkshire Archive Service, Wakefield.