GMC and Chev used the same cab for 1/2 ton up through 2 ton and everything related to the cab that is available for 1/2 ton will work for the 300. The entire front clip on 1 1/4 1/12 and 2 ton is larger to accommodate larger tires. I don't think any reproduction parts are available for the front clip. You will have to either repair any front sheet metal damage or find a parts vehicle. Larger parts vehicles only fetch scrap iron prices.