Ask this question at www.ahooga.com or www.fordbarn.com and you will probably get the best replies, as both are totally dedicated to the Model A hobby. The fordbarn site also has a street rod area to boot. Ask for Jim Masson at ahooga and someone there can direct you to his website. He is a purist, and can easily direct you to what you are looking for. Tam's, Snyder's and Bratton's also have online catalogs and maybe one of them has what you need. All of these are better than Mac's to deal with in Model A parts. Not that Mac's is bad, but these vendors are better thought of by most purists in the Model A hobby.
Huey