HtmlHelper para o tipo do produto segundo as tabelas utilizadas no SPED

HtmlHelpers.cs

using System;
using System.Collections.Generic;
using System.Linq.Expressions;
using System.Web.Mvc;
using System.Web.Mvc.Html;

namespace HtmlHelpers
{
    public static class HtmlHelperExtensions
    {
        public static MvcHtmlString TipoProdutoDropDownListFor<TModel, TProperty>(this HtmlHelper<TModel> htmlHelper, Expression<Func<TModel, TProperty>> expression, object htmlAttributes)
        {
            var metadata = ModelMetadata.FromLambdaExpression(expression, htmlHelper.ViewData);
            var valor = metadata.Model;
            var itens = new List<SelectListItem>
            {
                new SelectListItem {Selected = string.Equals(valor, "00"), Value = "00", Text = "Mercadoria para Revenda"},
                new SelectListItem {Selected = string.Equals(valor, "01"), Value = "01", Text = "Matéria Pima"},
                new SelectListItem {Selected = string.Equals(valor, "02"), Value = "02", Text = "Embalagem"},
                new SelectListItem {Selected = string.Equals(valor, "03"), Value = "03", Text = "Produto em Processo"},
                new SelectListItem {Selected = string.Equals(valor, "04"), Value = "04", Text = "Produto Acabado"},
                new SelectListItem {Selected = string.Equals(valor, "05"), Value = "05", Text = "Subproduto"},
                new SelectListItem {Selected = string.Equals(valor, "06"), Value = "06", Text = "Produto Intermediário"},
                new SelectListItem {Selected = string.Equals(valor, "07"), Value = "07", Text = "Material de Uso/Consumo"},
                new SelectListItem {Selected = string.Equals(valor, "08"), Value = "08", Text = "Ativo Imobilizado"},
                new SelectListItem {Selected = string.Equals(valor, "09"), Value = "09", Text = "Serviços"},
                new SelectListItem {Selected = string.Equals(valor, "10"), Value = "10", Text = "Outros Insumos"},
                new SelectListItem {Selected = string.Equals(valor, "99"), Value = "99", Text = "Outros"}
            };
            return htmlHelper.DropDownListFor(expression, itens, htmlAttributes);
        }
    }
}