There will be no Form 1099-B because nothing about a Roth conversion from a traditional IRA is permitted to involve the sale of capital assets outside of an IRA. There will only be a Form 1099-R reporting the distribution from the traditional IRA and a Form 5498 reporting the amount deposited into the Roth IRA as a Roth conversion.
The only time that there could be a Form 1099-B when moving funds from a qualified retirement account to a Roth IRA is if an in-kind distribution is made from a qualified retirement plan (401(k), 403(b), 457(b) or the federal TSP), the property is then sold and the cash proceeds are then rolled over to a Roth IRA.
There is no such thing as Form 1099-D. Perhaps you meant Schedule D being filed as a result of having received a Form 1099-B when there has been an in-kind distribution from a qualified retirement plan and the property is subsequently sold outside of any retirement plan.
