Frame Connectors bolt in or weld in?

Got a new Mancini flyer and looking at frame connectors. The weld in's are $190 and the bolt in are $140. Can't I get the bolt in and just weld them. I was also looking at the lakewood drive shaft loop they sell thats is $27. Trying to get the 69 cuda ready to run at the Little guy nationals at VA. motorsports park in May. I was just going to make the loop but for that price I'm thinking twice. Wanted to hear some thoughts for ya'll. Thanks Tom
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